Busses do not run from one resort hotel to another. THey run between resorts and parks. So to to get to the Magic Kingdom resorts which have a monorail, you would have to take a bus to Magic Kingdom anyway. So monorail would not be an efficient way to get to the MK from your on-site hotel. BUt you can ride the monorail from the MK to the MK resorts anytime just to visit them.
I was assuming you meant a shuttle from your on-site Disney hotel. If you meant an off-site hotel, then its shuttle would drop you off at TTC, and then you take a monorail to MK.