Since RMDs were waived for 2020 and this distribution was not made until 2021, this distribution has nothing to do with 2020 despite you having requested that it be made in 2020. As MinhT1 said, it constitutes part or all of your 2021 RMD. If you want to limit your distributions in 2021 to just the 2021 RMD, make sure that any subsequent distributions do not exceed the remaining portion of your 2021 RMD.
