I imagine once a preferred appointee is identified there would be a few days (1-3) of contractual negotiations involving the coaches manager and coach with the club.The list management team will have an approach. It doesn't take weeks for a new coach to have a 2 hour appointment with them outlining his vision before trade week.
They also may have very well appointed them but are waiting on a few other things to line up before announcing it.
It really isn't going to matter if it's tomorrow or next Tuesday.