If you are travelling back from India, I believe you should apply from India and not US. I might be wrong.
You will have to visit the Visa office and submit your application. They will courier your passport back to you once it's approved.
If they require new photos they would be emailing you, it would be better to call IRCC after 45 days to check the status of your application. Mostly the email will be sent to you after 60 days which is the time required to process new PR cards.
You can also link your application to your account...
I was waiting for my first PR card and had to travel back to India, so I had to apply for PRTD for my return.
My PRTD timeline
January 25th – Applied at Chennai VFS office
January 27th – Forwarded to Bangalore Visa Office
February 02nd – Approved
February 03rd – Passport received through...