The latest update for OnePlus 9R carries firmware version OxygenOS 11.2.3.3. According to the official forum post, it reduces power consumption and fixes several known issues for a better experience. 

OnePlus 9R OxygenOS 11.2.3.3 update changelog:

System

Reduced power consumption in specific scenarios Fixed known issues for a better experience

The update weighs just over 100MB. As usual, the OTA update is rolling out in an incremental fashion, which means that it will initially reach a small percentage of users and then a broader rollout, if no critical bugs are found. You can manually check for the latest update by navigating to Settings » System » System update » Check for update.

OnePlus 9R gets OxygenOS 11 2 3 3 Hotfix update to fix battery drain issue - 87