Hi Ian,
The appropriate time to leave dating apps is when you have both decided to date exclusively.
Don’t make the assumption that just because you are really interested in this person that they will also shut down their dating apps. It needs to be a mutual act. Then and only then, are you both on the same page.
And no, once you both decide to date exclusively, you shouldn’t maintain dating profiles on dating apps. Doing so would make it hard for your new partner to trust you and you don’t want that.