During the winter the singalong portion starts at 7pm and Chip & Dale are there at that time. There are songs, they walk the rows for pictures and high fives, then depart about 740pm. The songs are over then too and the movie rolls.
So I guess it depends on your point of view. If you are going to the Fort "movie" that night, then it might appear that C&D come out early. But the times have been pretty consistent for literally decades.
"Summer" hours start basically March 1 through October 31 while the clocks are turned forward with the singalong at 8pm and movie at 840pm. That's why I distinguished. I see in your signature a Poly Villa stay this month so you should be there by 7pm.
Bama Ed
PS - the fires get lit at 630pm (no songs, no characters, just a CM fanning the flames - but the fire takes a while to get going. But you can come then to start the roasting marshmallow action.