Hi there 👋 and warm welcome
Sometimes LTE watches receive updates later like a phones, Updates shouldn't be tied to whether specific features are enabled or not. Having LTE activated may be a determining factor of when you get updates. A LTE watch model that was carrier locked usually receive updates based upon when the carrier wants to release them, at least with previous models, because the carrier would urther test the update to make sure it worked properly on their service. The watch 6 being an unlocked device hough have any carrier specific update delays though, so you might wait few days or so, hopefully not too long.
