You seem to mean this comment to imply that the question itself is ridiculous because of course it's meaningless. But I've interviewed at two schools that explicitly encouraged post interview updates. Are they just lying? Seems an odd thing to bother saying if they don't care, given that staff time has to be spent on receiving the updates. I've also been to one school where post interview updates were explicitly not allowed, so it's something that varies from school to school.
If you have a substantial update I'd send it regardless of where you are in the process as long as the school doesn't forbid it.