The Galaxy Z Flip 5G is Samsung's refreshed premium clamshell foldable. It ia also one of the latest devices to start to see the One UI firmware upgrade. Then again, this new OTA is reportedly only pushed to global units sold in Switzerland as yet. However, more widespread availability for others with this cutting-edge phone should follow shortly.
https://www.notebookcheck.net/The-One-UI-3-0-with-Android-11-update-starts-to-hit-the-Galaxy-Z-Flip-5G.511398.0.html