I linked a search which suggested the latest / last manufacturers download has these features
Product Name
What’s New
Version
Updated On
OnePlus 6T
Security Patch to 2021.09
11.1.1.1
October 30, 2021
What I did not see in the link is the Android version.
For the purposes of a user like @zero contemplating an Upgrade from Android pie, wanting to upgrade /e/OS to the current version, the most important thing to have is