Babies change colour rapidly once they hatch, but eggs laid by a melanoid (or any other non-albino) female will be black/brown to start with. My wildtype female laid black eggs, the albino babies started out grey-peach and lightenend up, my albino female laid white eggs and the wildtypes looked leucistic to start with, and darkened over the first week.
You may find they change colour in the last day or 2 before they hatch, or they may not - it very much depends on the genetics. With a melanoid x leucistic any colour is possible, but you'll probably end up with at least half wildtypes.