The voting has been opened, OpaVote emails should have been sent (and if not, it is now worth investigating).
We should be able to handle some late registrations. But it is manual and laggy (as mentioned before).
PS. I find A note about STV elections a good effort in explaining some corner cases of STV
PPS. Voting will be stopped manually as soon as feasible after the expiry of 2025-11-01 Anywhere on Earth (i.e. after 23:59:59 UTC-12)