The confusion over Samsung's rollout of the Android 10 based One UI 2.0 for the Galaxy S9 series seems to be settling as users around the globe have been reporting the update's availability. Owners of the Galaxy S9 and Galaxy S9 Plus from countries as far apart as India, the UK, Slovenia, and Australia have been reporting receiving the new software.
https://www.notebookcheck.net/Samsung-Galaxy-S9-and-S9-Plus-user-reports-indicate-wider-global-rollout-of-One-UI-2-0.452825.0.html