It takes about 25 hours for an egg to travel through the hen's internal laying factory. That egg can only be fertilized in the first 15 minutes or so of that journey. So, if the mating takes place Monday, Monday's egg will not be fertile. It started its journey before the mating.
Tuesday's egg might or might not be fertile. It depends on what time of day the mating took place and what time the egg started its internal journey.
Wednesday's egg will almost certainly be fertile if the hen and rooster are fertile.
Notice that this is after a mating. A rooster does not necessarily mate with every hen every day. I'd wait a couple of extra days to be more sure.
After a mating, a hen normally stores the sperm and it remains fertile for about two weeks. It can be a couple of days less or it could even be three weeks, but two full weeks is normal and what most people use.