Well the honey will always be usable.....
Though from what I understand, you need to get the coffee beans roasted, or roasted in batches with different levels of roasting on each batch to give a variation/complexity of flavour before deciding whether you're gonna use brewed coffee for the flavour, or whether you're gonna try and just use the ground beans ? Or just drink the coffee while you're waiting for the honey to ferment after mixing it into a recipe of some sort