The OnePlus 7 Pro started receiving the update to Android 10 back in September, but that unfortunately hasn't applied to all units out there. Specifically, those phones sold by T-Mobile in the States have been stuck on Android 9 Pie until today.
Now though, owners of a OnePlus 7 Pro purchased from T-Mobile finally have a reason to celebrate. OxygenOS 10.0.1 is rolling out for the handset. It includes everything that's new in Android 10, as well as the November security patches. Yes, that's almost two months late, but OnePlus has yet to figure out how to be more timely about security updates.
Additionally, you get improved system stability and general bug fixes, unsurprisingly. The rollout is staged as always, which means that only a subset of T-Mobile OnePlus 7 Pro units are getting it today. It will reach more devices in a few days if no show stopping bugs are found in the meantime. Once you do receive the update notification, expect to deal with a 1.9GB download.