The Samsung Galaxy Note 9 has started receiving One UI 2.5, its final OS update. One UI 2.5 brings wireless DeX and changes to the camera app, among other alterations. The update has gone live as an OTA in Germany and will be reaching other regions shortly.
https://www.notebookcheck.net/The-Samsung-Galaxy-Note-9-receives-One-UI-2-5-update.498262.0.html