potty watch question

Hi everyone! My 2.5 old (M) has been potty training and we decided to give the potty watch a try. So far it’s going really well! He has learned that the song playing means it’s time to go and runs to the bathroom yelling “potty time!!” It’s honestly so cute and I like the reminder to hold us both accountable.

My question is, when do I take the watch off? Yesterday we did the watch with 30 min intervals and today he’s going an hour in between and staying dry.

Just wondering at what point I should take the watch off. I know he understands NOT to go in his underwear, but hoping he will grasp here soon to go to the potty when he needs to, not just when the watch tells him. Thanks guys!