The Redmi Note 9 Pro and Redmi Note 9S are two sides of a coin, and both phones are currently receiving new updates in different regions. Sadly, the updates don't bring MIUI 12 as most owners would expect, but there's official confirmation that a rollout isn't far off.
https://www.notebookcheck.net/New-updates-are-landing-on-the-Redmi-Note-9-Pro-and-Redmi-Note-9S-across-the-board.482609.0.html