Two weeks ago, OnePlus released the Android 10 beta update to the OnePlus 6 and 6T. Both devices are now receiving the stable Android 10 OTA, however. The OnePlus 5 and 5T are expected to follow suit next year.
https://www.notebookcheck.net/The-OnePlus-6-and-6T-are-now-receiving-the-stable-Android-10-update.440711.0.html