I have the S10+ in India, bought in India and I can confirm that the
beta is not out yet. Initially it was set to release yesterday, but the
release was postponed. The rollout in Europe has been halted as well.
You need to take into consideration that it isn't just a security
update. We'll be getting a lot of new features that were launched with
the note 10. Let them take their time and test it out. Better to have a
stable update than a fast one with bugs.