The department is administered and governed by the police commissioner, who is appointed by the mayor to what is, nominally, a five year term.

Can Zohran fire the existing commissioner and replace him? Idk what the bureaucracy around that looks like. Entrenched power structures have a way of slow rolling executives thru don't like and ignoring rules they don't want to follow.

A lot of levers of power that worked for a Guliani or an Adams might suddenly stop working assuming Zohran can make it all the way through the general and into office.