Deep Crystal Carnabua is fine (stage 3), The main thing by adding a wax layer is to protect all the cleaning and polishing stages you have just done. It will also add a bit more depth & wetness to teh paint finish.
There is better wax's out there but if thats what you have that will be fine.
People dont realise how hard work it can be to detail a car, esp 5-8hrs with a cheap rotary.
