I think your police is complete enough to go in. The fire dept is the only one that seems to be lagging behind. You already have ambulances for sure, so no worries there.
Just dont overthink it, and try to playtest your mod ingame as often as possible. Try to spend more time ingame than in editor so you are reminded of what the end-goal is: To have a fully functioning mod that can last the player at least 2 hours.