There is no 2020 Form 1099-R to wait for or needed to complete your 2020 tax return. The traditional IRA contribution for 2020 must be reported on your 2020 tax return on Form 8606.
The Roth conversion performed in 2021 has nothing to do with your 2020 tax return. The Roth conversion performed in 2021 is reportable on your 2021 tax return. You'll receive the 2021 Form 1099-R near the end of January 2022, before you file your 2021 tax return.
