In Workflow Rules we can define Time Based workflow actions , but when you select Every time record is created or Editied.
In Process builder , Scheduled Actions Appears only when you selected Wehn new Record is Created.

I was wondering , Scheduled Actions when it will be run , for Example.

I have a record has been created and I need a certain action to be executed when Record status is Changed to be Issued , like we need to to Send Email Notification Before 30 Days of Visa expiry.

How this will work on Process builder.

Thanks