how do I locate new 2021 RMD tax tables

I'd tell yo to just "google" it. But, you've probably already experienced that frustration.  

Here's some piecemeal info

https://www.msn.com/en-us/money/personalfinance/ira-required-minimum-distributions-table-2022/ar-BB1eDVxh

https://www.fidelity.com/bin-public/060_www_fidelity_com/documents/Joint-Life-Expectancy-Table.pdf

As of February 2, 2022, The tax year 2021 version of IRS Publication Publication 590-B, Distributions from Individual Retirement Arrangements (IRAs), which contains the tables, has not yet been published.

However, you can find the draft version by typing 590-b into the search box on the IRS’ Draft Tax Forms page.  The tables are in the draft document.

Please heed the Caution on the front page of the draft publication.