Google only just released Android Q eighteen days ago and OnePlus is already sending out the update to its current devices, the OnePlus 7 and OnePlus 7 Pro. The update introduces OxygenOS 10 and will be a staged rollout over the next couple of days.
https://www.notebookcheck.net/The-OnePlus-7-and-OnePlus-7-Pro-receive-the-Android-Q-update.435123.0.html