Hi there,
According to our trailhead module, we can get picklist value by Object Name and Field Name.
Trailhead Module (https://trailhead.salesforce.com/en/content/learn/projects/workshop-override-standard-action/override_2)

@AuraEnabled        
public static List<String> getPickListValuesIntoList(String objectType, String selectedField){
    List<String> pickListValuesList = new List<String>();
    Schema.SObjectType convertToObj = Schema.getGlobalDescribe().get(objectType);
    Schema.DescribeSObjectResult res = convertToObj.getDescribe();
    Schema.DescribeFieldResult fieldResult = res.fields.getMap().get(selectedField).getDescribe();
    List<Schema.PicklistEntry> ple = fieldResult.getPicklistValues();
    for( Schema.PicklistEntry pickListVal : ple){
        pickListValuesList.add(pickListVal.getLabel());
    }     
    return pickListValuesList;
}

I want to add RecordTypeId to that method.
Any good idea for that?
Thank in advance.
Regards,
LinThaw