There is a 0% chance this game will get monthly updates. Never has a game gone from releasing a couple of times a year to releasing monthly. The opposite has happened numerous times.well if dev switches to monthly updates then it's only under 30 years.
Only new games tend to have 1-3 month release schedules.
Bigger / Older games are always 6 months+
Nobody wants quickly thrown together updates with 300 renders once a month. Everyone wants the multi thousand render big updates.
When games do release on a 1-3 month schedule they are almost always doing it that way barbecue they are new and nobody knows about the game yet, and the upload size is really tiny.