Do you mean the RMD? Required Minimum Distribution. For 2020 it has been suspended due to Covid-19.
You must take your first required minimum distribution for the year in which you turn age 70½. However, the first payment can be delayed until April 1 of the year following the year in which you turn 70½. For all subsequent years, including the year in which you were paid the first RMD by April 1, you must take the RMD by December 31 of the year.
If you wait to take it the next year you will also need to take the next year's RMD by Dec 31. So you will need to take 2 RMD.
Each plan might automatically send you the amount at the beginning of the year. Mine did. If they are the same kind of accounts like IRA you can take the total RMD for all of them from one account or split it up. You have to take the RMD separately from IRA and 401k accounts.
Once you determine a separate required minimum distribution from each of your traditional IRAs, you can total these minimum amounts and take them from any one or more of your traditional IRAs.
See this IRS FAQ on RMDs….
Here is a worksheet to calculate the RMD