Retirement tax questions

I am aware, but you didn't read my post. I DID file my 2019 taxes but they weren't processed until my 2020 taxes were already done, submitted and my refund was issued for the 2020 taxes. I mailed in my 2019 taxes because I share a child with another person who efiled before I did so TurboTax didn't allow my taxes to be eFiled. I mailed them in and I guess they just sat there for 18 months because of COVID. This was a real thing. They had millions of unopened returns sitting in a warehouse because they had no one to work.  On top of that,  they wouldn't let me file a second time. So I could do nothing but wait. My 2019 taxes were filed in  2020 and the IRS paid me interest for having waited so long for the return to be processed n 2021, but that didn't help me when it came to the first stim check in 2020. Since my 2019 taxes hadn't processed it was as if I hadn't filed. The only way I could prove I filed was to wait for the return to process.