The MIUI 12 update for the Redmi Note 8 Pro is being released globally after spending quite some in a Phase 2 beta test program. The update will be initially available for Mi Pilot testers but will be seeded to most other devices by the end of this month. Also, Xiaomi has confirmed that the Mi 6 will not be getting either Android 10 or MIUI 12.
https://www.notebookcheck.net/Xiaomi-Redmi-Note-8-Pro-final-stable-MIUI-12-update-released-globally-however-Xiaomi-confirms-that-it-s-end-of-the-road-for-Xiaomi-Mi-6-owners.481656.0.html