The IRS is terribly, terribly backed up with paper returns. If you do file by mail, make sure to send certified or any other method where you can get proof of mailing and proof of receipt. I did that for an amended 2019 return, and for my 2020 return - they have it, I have the dates they received it, but it still has not been recorded onto my IRS.gov account, after all this time. Hence, no refund or stimmies (yet).
