Hello
I am a little stuck on this and am pretty sure I need to use a Schedule Apex Job for this but I am not sure how to modify my class or whether this is the best approach. I already have a class written, which works great. What the class does is that when a client record is created, an email sent to the client owner that displays some information and has some attachments. The reason why I wrote a class instead of workflow etc is because the apex class uses logic to determine what type of email body/template and attachment needs to be selected(based on the client's company). So the apex class generates that body and sends the email. The problem is due to a new business requirement. They want this email sent 2 DAYS AFTER the client is released/created. Here is a snippet of my code. Can someone please let me know what I need to do to use Schedule Apex, or perhaps modify it to use Process Builder? Please let me know what the best way is. I tried using the Schedule apex Trailhead and I am still confused.

global class LM_ChangeAccountRT {
    
    
    @AuraEnabled
    public static String resendEmails(String accountId) {
        String response;
        
        
        try {
            
            Profile sysAdmin = [select id from profile where name='System Administrator']; 
            
            //Only send emails if user is either an ARMS Administor or System Administrator
            if (System.label.ARMS_Administrator_Profile_Id == userinfo.getProfileId() || sysAdmin.Id == userinfo.getProfileId()) {
                Account acc = [SELECT Id,FCA_Dealership__c,Branch_Manager__c,Business_Development_Manager__c,Client_Released__c,Existing_Participant__c,
                                    Dealership_Partner__c,Dealership_State__c,RecordTypeId,owner.email,owner.Supervisor_Email__c,Client_Number__c,Closing_Manager__r.name,
                                    Name,Completed_Date__c,Effective_Date__c,Closing_Manager__c,Is_the_client_receiving_compensation__c,Is_a_broker_receiving_compensation__c,Broker__r.name,
                                    Broker__r.Attention__c,Broker__r.Street_Address_1__c,Broker__r.Street_Address_2__c,Broker__r.ZipCode__c,Broker__r.City__c,Broker__r.State__c,
                                    Broker__r.Special_Notes__c, Business_Development_Manager__r.Email, Branch_Manager__r.Email, Dealership_Spiff_Payment__c, Agent__c, Agent_Email__c, Territory_Manager__c, Territory_Manager_Email__c
                                    FROM Account
                                    WHERE Id=:accountId];
                if (acc.Client_Number__c != null && acc.Client_Released__c) {
                    sendpdfgenerationEmails(acc);
                    response = 'Email Sent';
                }
                return response;
            } else {
                return 'Access Denied';
            }
                   
        } catch(Exception e) {
            System.debug(e.getMessage());
            return 'Error sending emails';
        }
    }
    
    // From Quick Action
    @AuraEnabled
    public static string updateAccountRecordType(String accountId,String rtName){
        string errormsg;
        try{ 
            system.debug('ARMS_Business_User_ProfileId---------->'+System.Label.ARMS_Business_User_ProfileId);    
            if(System.Label.ARMS_Business_User_ProfileId == userinfo.getProfileId())
                {
                    errormsg = 'Business_User';
                }
                else
                {
                    Account acc = [SELECT Id,FCA_Dealership__c,Branch_Manager__c,Business_Development_Manager__c,Client_Released__c,
                        Existing_Participant__c,Dealership_Partner__c,Dealership_State__c,RecordTypeId,owner.email,owner.Supervisor_Email__c,
                        Client_Number__c,Closing_Manager__r.name,Name,Completed_Date__c,Effective_Date__c,Closing_Manager__c,Is_the_client_receiving_compensation__c,
                        Is_a_broker_receiving_compensation__c,BrokerPayee__r.name,BrokerPayee__r.Attention__c, BrokerPayee__c,
                        BrokerPayee__r.Street_Address_1__c,BrokerPayee__r.Street_Address_2__c,BrokerPayee__r.City__c,BrokerPayee__r.State__c,BrokerPayee__r.ZipCode__c,
                        BrokerPayee__r.Special_Notes__c, BrokerPayee__r.Is_this_a_new_broker__c, Dealership_Spiff_Payment__c, Business_Development_Manager__r.Email,
                        Branch_Manager__r.Email, Agent__c, Agent_Email__c, Territory_Manager__c, Territory_Manager_Email__c FROM Account WHERE Id=:accountId];
                    acc.RecordTypeId = [SELECT Id FROM RecordType WHERE DeveloperName =:rtName AND sObjectType = 'Account'].Id;
                    system.debug('acc.Client_Released__c---------->'+acc.Client_Released__c);
                    if(acc.Client_Number__c!=null){
                        if(rtName=='Client_Record' && acc.Client_Released__c==false){ 
                           acc.Client_Released__c=true; 
                        }
                        update acc;
                        if(rtName=='Client_Record'){ 
                            
                            sendpdfgenerationEmails(acc);
                        }
                        if(rtName=='Client_Form_Cancelled'){
                            //Call cancellation approval process
                            //Dev Note Lawrence - Why approval if it is been changed to cancel?? I don't think this makes sense. 
                            Approval.ProcessSubmitRequest req1 = new Approval.ProcessSubmitRequest();
                            req1.setComments('Please approve client cancellation');
                            req1.setObjectId(acc.id);
                            req1.setProcessDefinitionNameOrId('LM_ClientCancelationAproval');
                            req1.setSkipEntryCriteria(true);
                            req1.setSubmitterId(acc.ownerid); 
                            Approval.ProcessResult result = Approval.process(req1); 
                        }
                    }
                    else{
                        errormsg = 'DisplayError';
                    } 
                   }
            return errormsg;
        }
        catch(Exception e){
            system.debug(e.getMessage());
            return null; 
        }
    }
    
    /*
    *  Method to send Confirmation card opt-in card by fetching visual force email template setup for different dealership.
    */
    @AuraEnabled
    public static void sendpdfgenerationEmails(Account acc){
         system.debug('start of confirmation card and pdf generation');
        //Logic to find which VF template is used to send an email.
        list<EmailTemplate> templateId = new list<EmailTemplate>();  
        string temppartner;
        String partner_opt_in_attachment;
        boolean sendFCAmail;
       
        List<Dealership_PDF_Generation__c> custsettingdata = Dealership_PDF_Generation__c.getall().values();
        System.debug('custom setting size = ' + custsettingdata.size());
        // Fetch State
        if(acc.Dealership_State__c!=null && acc.Dealership_Partner__c!=null)
        {
            for(Dealership_PDF_Generation__c tempcustsetting :custsettingdata)
            
            {   
                if(acc.Dealership_Partner__c == tempcustsetting.Dealership_Partner__c && acc.Dealership_State__c==tempcustsetting.State__c  && tempcustsetting.State__c=='WA' && acc.Dealership_State__c=='WA'){
                 
                        //For WA State
                       // temppartner= '%' + tempcustsetting.TEMPLATE_Unique_name__c + '%';
                        temppartner= tempcustsetting.TEMPLATE_Unique_name__c;
                        if(acc.Dealership_Spiff_Payment__c == '% premium'){
                            partner_opt_in_attachment=tempcustsetting.opt_in_form_premium__c;
                        }else{
                            partner_opt_in_attachment=tempcustsetting.opt_in_form_nonpremium__c;
                        }
                } 
                else if(acc.Dealership_Partner__c == tempcustsetting.Dealership_Partner__c && acc.Dealership_State__c==tempcustsetting.State__c  && tempcustsetting.State__c=='TX' && acc.Dealership_State__c=='TX'){
                     //For TX State 
                        //temppartner= '%' + tempcustsetting.TEMPLATE_Unique_name__c + '%'; 
                        temppartner= tempcustsetting.TEMPLATE_Unique_name__c;
                        if(acc.Dealership_Spiff_Payment__c == '% premium'){
                            partner_opt_in_attachment=tempcustsetting.opt_in_form_premium__c;
                        }else{
                            partner_opt_in_attachment=tempcustsetting.opt_in_form_nonpremium__c;
                        }
                }
                else if(acc.Dealership_Partner__c == tempcustsetting.Dealership_Partner__c && acc.Dealership_State__c!=tempcustsetting.State__c && tempcustsetting.State__c!='TX' && acc.Dealership_State__c!='TX' && acc.Dealership_State__c!='WA' &&tempcustsetting.State__c!='WA' ){
                      //For Non TX State
                      //temppartner= '%' + tempcustsetting.TEMPLATE_Unique_name__c + '%';
                      temppartner= tempcustsetting.TEMPLATE_Unique_name__c;
                      if(acc.Dealership_Spiff_Payment__c == '% premium'){
                            partner_opt_in_attachment=tempcustsetting.opt_in_form_premium__c;
                        }else{
                            partner_opt_in_attachment=tempcustsetting.opt_in_form_nonpremium__c;
                        }
                      system.debug('grabbed template: ' + temppartner);
                }
                //else if(acc.Dealership_Partner__c == tempcustsetting.Dealership_Partner__c) {
                     //temppartner= '%' + tempcustsetting.TEMPLATE_Unique_name__c + '%';
                //   temppartner= tempcustsetting.TEMPLATE_Unique_name__c;
                //   partner_opt_in_attachment = tempcustsetting.Opt_in_form__c;
                     
                //   system.debug('grabbed template: ' + temppartner);
                //}
            } 
        } 
        if(acc.Dealership_Partner__c != null && temppartner!=null ){
              system.debug('temppartner------------->'+temppartner);
              if(temppartner.contains('FCA') && acc.FCA_Dealership__c==true){ 
                  sendFCAmail = true;
              }
              else if(!temppartner.contains('FCA')){
                  sendFCAmail = true; 
              }
              else{
                   sendFCAmail = false; 
              } 

              // PWC originally used a LIKE in the where clause.  That didn't work for the way we built the Service Program template.
              templateId.add([Select id,DeveloperName from EmailTemplate where DeveloperName = :temppartner]);
             
        } 
        
        
        if(templateId!=null && templateId.size() > 0 && sendFCAmail){  
            string accwhatid = acc.id; 
            string emailid = acc.owner.id;
            string Supervisoremailid;
            string BDMcontact;
            string territoryManagerEmail = acc.Territory_Manager_Email__c;
            string agentEmail = acc.Agent_Email__c;
            
            if(acc.Branch_Manager__c!=null){
               Supervisoremailid = acc.Branch_Manager__c;
            } 
            if(acc.Business_Development_Manager__c!=null){  
                        BDMcontact = acc.Business_Development_Manager__c;
            } 
            list<Messaging.SingleEmailMessage> emails = new list<Messaging.SingleEmailMessage>(); 
             
            if(emailid!=null && acc.Owner.Email!= null){    
                    Messaging.SingleEmailMessage messageowner = new Messaging.SingleEmailMessage(); 
                    messageowner.setTemplateId(templateId[0].id); // Id of template that needs to rendered
                    messageowner.setTargetObjectId(emailid); // setTargetObjectId= user to which we need to send an email
                    messageowner.setSaveAsActivity(false);  // This is set as false while calling from apex
                    messageowner.setWhatId(accwhatid);   // Whatid is the ID of account used in template for merge fields
                    emails.add(messageowner);
            } 
            if(Supervisoremailid!=null && acc.Branch_Manager__r.Email != null){
                    Messaging.SingleEmailMessage messageSupervisor = new Messaging.SingleEmailMessage(); 
                    messageSupervisor.setTemplateId(templateId[0].id); // Id of template that needs to rendered
                    messageSupervisor.setTargetObjectId(Supervisoremailid); // setTargetObjectId= user to which we need to send an email
                    messageSupervisor.setSaveAsActivity(false); 
                    messageSupervisor.setWhatId(accwhatid);   // Whatid is the ID of account used in template for merge fields
                    emails.add(messageSupervisor);
            }  
            if(BDMcontact!=null && acc.Business_Development_Manager__r.email != null){
                    Messaging.SingleEmailMessage messageContact = new Messaging.SingleEmailMessage(); 
                    messageContact.setTemplateId(templateId[0].id); // Id of template that needs to rendered
                    messageContact.setTargetObjectId(BDMcontact); // setTargetObjectId= user to which we need to send an email
                    messageContact.setSaveAsActivity(false); // This is set as false while calling from apex
                    messageContact.setWhatId(accwhatid);   // Whatid is the ID of account used in template for merge fields
                    emails.add(messageContact);
            } 
                
            if(acc.Dealership_Partner__c.contains('EAM Non-OEM') && territoryManagerEmail!=null && emailid!=null && acc.Owner.Email!= null){
                Messaging.SingleEmailMessage agentMessage = new Messaging.SingleEmailMessage(); 
                String[] toAgent = new String[] {agentEmail};
                String[] tomEmail = new String[] {'Thomas.Papke@LibertyMutual.com'};
                agentMessage.setTemplateId(templateId[0].id); // Id of template that needs to rendered
                agentMessage.setTargetObjectId(emailid); // setTargetObjectId= user to which we need to send an email
                agentMessage.setToAddresses(toAgent);
                tomEmail.add(territoryManagerEmail);
                agentMessage.setccAddresses(tomEmail);
                agentMessage.setSaveAsActivity(false); // This is set as false while calling from apex
                agentMessage.setWhatId(accwhatid);   // Whatid is the ID of account used in template for merge fields
                emails.add(agentMessage);
            }
            
            // If available attach the opt-in card
            if (partner_opt_in_attachment != null) {
                StaticResource sr = [Select  s.Name, s.Id, s.Body From StaticResource s where s.Name =: partner_opt_in_attachment]; // 'static_resource' is the name of the static resource PDF.
                
                Blob tempBlob = sr.Body;
                
                Messaging.EmailFileAttachment efa = new Messaging.EmailFileAttachment();
                efa.setBody(tempBlob);
                efa.setFileName('Opt-in.pdf');
                
                List<Messaging.EmailFileAttachment> attachments = new List<Messaging.EmailFileAttachment>();
                attachments.add(efa);
                // add attachment to each email
                for (Messaging.SingleEmailMessage email : emails) {
                    email.setFileAttachments(attachments);
                }
                
            }
            system.debug('email sent: ' + emails.size());
            Messaging.sendEmail(emails); 
            
        }
    } 
}

Thank you everyone for your help