It's been a long time since I got any new watch software over the air on my F5X+ (Ti DLC).
I have tried turning off and on Auto Update on the watch, rebooting it, etc.
I'm currently on 7.55 beta and 7.60 is supposed to be released to all users.
I know about the server issue making it impossible to update over Garmin Express right now but this is unrelated.
It doesn't matter if I sync with Wifi directly to the network or with BT over my iPhone 8 running iOS 12.3.1 (latest).
No software updates ever comes over the air.