WordPress 5.3 “Kirk” has been released.
I guess many of the people out there are running on hosted solutions, so your upgrade will happen when your hosting company decides to apply it. For those that self-host, you’re just a button press away.
This morning I’ve updated 5 separate blogs, all hosted independently, and they all went through fine. At the moment the upgrades have to be manually initiated, but I’m guessing in a few days they’ll just run through automatically.