Oppo appears to be taking a proactive approach to Android 11. The phone maker will reportedly start testing a beta version of its Android 11-based ColorOS ROM on phones including the Find X2 and Reno3, starting on September 7th.

Tipster @UniverseIce spotted an Oppo forum announcement calling for beta testers for the phone maker’s new Android 11-based ColorOS 8 operating system. The forum post states that beta testers will be able to access the new version of ColorOS from September 7th onwards. 
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https://www.notebookcheck.net/Oppo-is-beta-testing-Android-11-ColorOS-8-on-the-Find-X2-Find-X2-Pro-Reno3-and-Reno3-Pro-official-ROM-could-arrive-on-Android-11-launch-day.492251.0.html