Xiaomi has seeded a new Beta Stable update for the Redmi 9, and it brings with it quite a few changes for the device. Not only does it upgrade the global version of the handset to the November 2020 security patch, but it upgrades it to MIUI 12. V12.0.1.0.QJCMIXM is available to download now as an OTA or as a recovery ROM.
https://www.notebookcheck.net/Global-MIUI-12-update-arrives-for-the-Xiaomi-Redmi-9-with-the-November-security-patch.506265.0.html