At the moment the integrated updater has been disabled for known bugs on many cases. The new updater that can be tested at Test our new work-in-progress upgrader script should be able to offer this update. You need to configure it to “updates.nextcloud.org/updater_server/” and might need to wait for up to one hour until our caching is all gone. (will manually clear caches soon though as well)
Added there 
Yes. Check the video that is linked:
