All your boxes should be packed before moving day. Moving day will already be busy enough. The last thing you will want to be doing is packing on moving day. The movers to like to scan everything that is to be loaded up on their truck before starting. This gives them a good idea of how and when things should be packed. For example: if you are packing a fragile box and the movers have already placed the fragile boxes together on the truck then it makes it harder for the movers to find a secure place for the new box. If you’re not having to pack on moving day it also frees you up to help the movers with any questions they have.