Because the tax deadline for 2020 Tax Returns was postponed until May 17th, 2021, you have until May 17, 2024 to file your 2020 return and claim a refund.
Please see this article from the Taxpayer Advocate: Last Chance to Claim the 2020 Recovery Rebate
It is fine to go to the post office ON May 17th, your post mark just has to be May17, 2024 or earlier.
Please see this TurboTax Help Article for details on filing prior year returns: How do I prepare a prior year return?
[Edited 04/13/24|6:52pm PST]
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