Before applying wax the paint needs to be really clear of any contamination. It's best to polish it prior to waxing.I've gave my car a quick wash and dry tonight, if not used should I be ok to go straight on with the wax on Thursday night/ Friday morning?
If it's stored indoors it's ok to pick up where you left off but you'd still to well to remove any dust etc with a detailer spray before you carry on....and we need pics of your shiny car when it's done!