Don,
Alots going to depend on the shape of the fish and what you feed them. The first day I get in fish I don't feed them at all. And if the shipper did their job well.. they will have been fasted as well before shipping. If thats the case, theres little waste day one from feces...just ammonia excreted from normal functions...so day one, a huge water change at the end of the day is fine. Day 2, I feed sparingly...and only a clean food. One feeding is fine...maybe 2 if they aggressively eat the first. I clean all wastes after giving them about 30 mins to eat... rather than a large 90 % wc... I prefer to do 2 large ones... morning and night....usually 75-80 %..sometimes more. Ammonia tests kits would be adviseable and let the results guide your water changes , though I don't use them myself with this procedure anymore.
If the fish traveled well, I may add biofilters in 3-4 days... sometimes I go longer....Technically with these kinds of water changes... you will slowly very slowly have a bio filter develop,but cycling a tank with fish in it is risky and not my goal.
hth,
al