Yes, you will select P and don't worry about it saying "Return of contribution Taxable in 2018" TurboTax will ask for which year the form was and you will answer 2020. Then TurboTax knows that the P stands for "Return of contribution Taxable in 2019".
You are on the correct page and yes all questions are about the 1099-R that you will get in 2021, but you are creating a substitute 1099-R.
If you do not feel comfortable creating a substitute 1099-R then you can wait until next year and then amend your 2019 tax return once you receive the 1099-R in 2021.
@Drdok1
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