I still hadn't done my Thanksgiving shopping when I walked into Whole Foods this morning to get a muffin. I was shocked to find the place rather empty. I grabbed a cart and whizzed through the store in about 15 minutes, grabbing everything I needed (including an 11-pound turkey).
From my past experience, I strongly recommend getting what you need today, especially the turkey. Tonight and all day tomorrow, the stores will be jampacked (and the selection of turkeys will either dwindle or evaporate entirely).