Why it isn’t under announcements and just under the general forums is beyond me.
https://us.forums.blizzard.com/en/overwatch/t/overwatch-2-maintenance-march-20/790805
Overwatch 2, along with all Blizzard games, will be undergoing server maintenance starting on Monday, March 20, at 5:00 AM PDT and will last for approximately 30 minutes.