I did a test, and it's taking longer than I expected (and hasn't been delivered yet)
These wikis are:
[Update, 24 August:] Notifications for new topics are still not arriving at mediawiki.org, bumping to unbreak now. Discussed at https://www.mediawiki.org/wiki/Topic:Snfgy7p12r7jbjen
(If it's from the DB issue, the actual list is labswiki, mediawikiwiki, metawiki, officewiki).