Yes, Patreon is a monthly subscription thing; you have access to the EA versions only while you're subscribed, so 2 versions(3-week update schedule).
If you unsubscribe, you of course keep what you downloaded(and the said bonus scenes, but the cheats are linked to a version.)
If you sub for one month, you’ll get access to those two Patreon builds, and after you can keep updating with the free versions once they catch up. (but you then, of course, lose access to cheats for the future EA versions)
You can join anytime, but I’d only suggest doing it if it’s something you can comfortably afford.
If you have any other questions, you can ask me on Discord ^^