https://wccftech.com/oneplus-8-8-pro-now-receiving-oxygenos-10-5-8-may-security-patch-camera-and-display-tweaks-are-included/

OnePlus 8 and 8 Pro devices around the world have started receiving a new version of OxygenOS which also happens to be one of the most extensive as far as the changes are concerned. Aside from the changes, the update also brings May 2020 Security Patch and is currently rolling out to users around the world.

Before you go ahead and start checking for update, you have to understand that the update is not rolling out widely. However, you are either going to get OxygenOS 10.5.8 or 10.5.10. Both over the air updates are the same but are differentiated by regions.