While previous information heavily indicated that the Redmi Note 8 Pro, Redmi Note 8, and Redmi Note 8T would not be eligible for Android 11, a new report leans towards the contrary. Apparently, the three phones are set to get Android 11 sometime in the future, with Xiaomi recently kickstarting internal testing.
https://www.notebookcheck.net/New-Xiaomi-Android-11-roadmap-reveals-that-the-Redmi-Note-8-Pro-and-Redmi-Note-8-duo-may-receive-the-update-after-all.505630.0.html