After you file

I had to wait for 6-8 months for my return to get approved and receive email. Till then I had no idea and I was worried if I had to pay penalty for filing late. 
but my tax agent was confident to answer that if ever such question comes up. 
as long as you have saved the postal receipt, you are safe to show proof of filing. 

and , don’t file again and that will cause confusion is what I am told. 

you can call IRS after 6 weeks to check in the status but I didn’t get through the answering machine. 

be confident and wait. And hold on to all the proof of filing. 

good luck