Xiaomi plans to start the first phase of releasing the Android 12 update for Redmi Note 11 and Redmi Note 11 NFC for a limited number of users.
MIUI 13.0.2.0 SGCMIXM update with a size of 2.7 GB will be released with the June 2022 security patch.

Android 12 update for Redmi Note 11
Redmi Note 11 is equipped with MIUI 13 user interface by default, but it runs on Android 11. In the new Android 12 update, many of the previous features are optimized and made available to the user.
You can check the settings and the latest updates of your phone and see if you qualify for this version. It is not yet clear when this operating system update will be released to the public.
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Source: gsmarena