For Steam, all updates are available on the beta branch (it's how we test internally). So anyone who got it on Steam (or got a Key from Patreon/Subscribestar) always gets latest update for the game as long as we put out new content. Once it's stable we shift it to the default branch (anyone with a key can opt into the beta branch, it's not some kind of tiered access).
If you've gotten a Steam Key for PL2 (went out last month), you'll be seeing an update in a week or two. We're hoping to have a rough version out on Thursday, then spend the next couple of days fixing bugs before we move the update to the default branch. Same deal with Sinners Landing, though we still have a lot of work to do on systems (next up; the dungeon system), so progress is a little slower than Paradise Lust 2.