While the IRS requires Required Minimum Distribution (RMD) amounts to be calculated starting in the year you (or your spouse) turned 70 and ½ years old (72 for those who turned 70 1/2 in 2020 or later), an RMD amount is not identified with a code on the Form 1099-R you receive to report your distributions for the year.
If you are 70 and ½ and older, TurboTax will ask several questions when you are entering your 1099-R information. The purpose of these questions is to help you determine if you have met the RMD criteria so that you can avoid the IRS penalty.
See this TurboTax help article for more information on this topic.
A mandatory distribution is just a normal distribution that is ineligible for rollover. You enter into box 7 of TurboTax's 1099-R form is whatever code is in box 7 of the Form 1099-R provided by the payer (which will be code7 in your case).
you must take your first RMD by April 1 if you did not take it already.
If you did not take any amount by Dec 31, you won't have a 1099-R for 2022 tax return and there will be nothing to do..