We were there last year Nov. 11-18 and most of the decorations were up.
The only thing that we saw unfinished was in a few resorts. When we visited the Boardwalk, they were still working on the lobby. However, the gingerbread house at the GF was finished and we were able to buy our shingle, and take our picture in front of it!
We loved being there with the decorations up! DH is even saying that he wants to do it again next year!!