Are you sure your car get a correct connectivity? With your car browser go to
Fast.com for example and test the download
and the upload speed.
Sometime the upload hang if the signal is too weak, and the server don't receive download status information.
A good remedy in this case is to install a WiFi booster in your garage.
Go to your car display and go to 'Controls' > Software Update Preference' and set to 'Advanced.'
Try to reboot your display from the screen or using your brake pedal and steering knobs.
In general I receive my messages updates in the evening. I went from 2019.20 to 2019.24 few days ago.
So let give another day otherwise go to your phone App and select 'Schedule Service' > 'Software Update' and send a message issue.
You should get contacted directly by text in general.
Some people recommend parking your car at or near a service center if there is one close by and do a reboot.