I was at Green Mtn with GMCO45 on Sunday. Nobody was further out than we were from what I could tell. The deepest water we were over was 60 feet but the ice was still the same there as it was near to shore, a solid 5 inches. I really couldn't tell you if it's safe over the middle or not, but with the cold week ahead I'm sure the whole lake will be good by the weekend.
P.S. I did see the kokes come through a few times 20-40 feet down over 60 feet of water if kokes are what you're after. I'm sure a good pop gear presentation on a jigging machine would have gotten them to stick around for a while.