After you file

Something new I’d notice about this process The tracking information said USPS drop the envelope on March 20 2021in Austin TX 73301 The next  two weeks I was getting messages from USPS your package is ready to pick up On April 3 2021 I got the message delivered ( Usps said on April 3 your package was delivered on March 20) So from where I have to start counting the weeks? March 20 or April 3?

My feeling is that the package really arrived to IRS hands on April 3 and for about two weeks the documents were on hold