OnePlus has finally started rolling out OxygenOS 11 based on Android 11 to the OnePlus 7 and OnePlus 7T series. All OnePlus 7, OnePlus 7 Pro, OnePlus 7T and OnePlus 7T Pro handsets should receive OnePlus' latest OS within the next few days. Still, the updates are already available to download and install manually.
https://www.notebookcheck.net/The-OnePlus-7-and-7T-series-finally-receive-Android-11-and-OxygenOS-11-updates.528931.0.html