Locked AT&T, just got the update.
BTW, a few weeks ago I did verify that AT&T is letting the S24 series get its updates like everyone else - right from Samsung's servers with any carrier related junk tagging along. Instead of builds sent to AT&T and AT&T doing their "testing" (delay and re-number the build) before sending it out to AT&T customers through their network only.
Now, so far, AT&T is still doing their own updates with older phones. The new method is only for the S24 line, and I assume, any new device released from here on out. I don't know about the status of the the Fold/Flip phones, but I'm guessing that the upcoming 6 models will be freed from being fed updates only through AT&T.