I would think that overnight, if you cooled the pie completely you could cover it and leave it on your counter for Friday and it should be fine.
I made the pumpkin cake with cream cheese glaze, and its been sitting out on my counter. I know that the glaze has cream cheese and probably technically should be refrigerated, but there were 2 issues with this: 1 no room in the fridge, and 2 I think that the fridge dries out the cake too much. So, I left it out and it seems to be fine. We will probably finish it up today or tomorrow, so it should be OK.
So, I would think that you could leave the cake out overnight too.
“When one door of happiness closes, another opens; but often we look so long at the closed
door that we do not see the one which has been opened for us.”
Helen Keller (1880–1968)