As of a couple of weeks ago, they were in virtually all resorts, including both sides of AKL. They were still being installed at SSR, and at the other multi-stop resorts they were installed but not working at all stops.
I don't know the status of the Epcot resorts; I haven't been by them in a while.
Yes, they are at Jambo House. I was there last month and the monitors were very helpful. I hope you are there at a less crowded time than we were...we stood on probably 90% of our trips that whole week. Oh well.....such is life.