Still worried

the cork is in the little hole (~3/8" hole = bee space) and there is a screw in it so I can pull the cork out easily

 the board keeps snow from blocking the opening over the landing board, the opening has a mouse guard over it

So I looked through the window today and it just seems like there is a paucity of bees, but mark reassures me that they are probably all clustered away from the window. I hope so.
Here is the photo of the piece of wood I put over the landing board/mouse guard and a close up of the cork I put in the escape hole. Keep your fingers crossed!!!