He knew Riker's service record. He knows the engine specs. He knows exactly where his quarters are just from hearing the room number. He is clearly fully prepped on everything he needs to know. He would know how much staff they have & how switching duty rotations works, enough to already know what their issues would be. You know who isn't fully prepped? Riker & his department heads. They don't know everything Jellico knows about what needs to be happening, & maybe he don't have time to hold every one of their hands, until they can be coaxed about it enough to be OK with it. It's an order. That's enough.
I'm not saying they blatantly demonstrated a personal dislike for Jellico from the start, but it's clear that even before they knew him at all, his addition to the crew is unwelcome, because it displaced Picard. In that ceremony, every head is down. Every expression is sullen. It's like the idea of a change of command is a prison sentence to them.
That tone is bad footing. It's frankly a shitty idea for command to have implemented to begin with, if this is a likely response, because it creates an immediate resentment which they ALL demonstrate, especially Riker. That's something for a new captain to deal with, & the way to deal with it is to shut it down so it doesn't gum up the works, as Riker seems intent on letting it do. Riker is in the position to shape every attitude on that ship, & the shape he's chosen is obstinance & disgruntlement