OnePlus 7 series has already been in Oxygen OS 12 Closed Beta stage .
Now OnePlus has Released new OxygenOS 11.0.71 with some minor Bugs fixes and April security patch.
Watch overview of Oxygen OS 12 video for Oneplus 7,7t,7pro,7t pro – LINK

OXYGEN OS 11.0.71 CHANGELOG:-
System
- Updated Android security patch to 2022-04
- General bug fixes to improve system stability
Wait for the OTA update. It will come to your device soon. This update may be the last probable Oxygen OS 11 update for the OnePlus 7 series. Stay tuned for Oxygen OS 12 beta.
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