I think it will be different by breed. I have four month old easter eggers that are not laying yet, but last year my Rhode Island Reds started laying just a little after that.
Fertilized eggs taste exactly the same. They do not develop at all unless incubated, even if you let them sit on the counter a few days. I know you are supposed to be able to see a bullseye in a fertilized egg, but honestly I don't even usually see that. There is no nutritional difference either, and egg color means nothing either nutrionally. What you feed your chickens does however.
To me store-bought eggs several months old are what sounds unappealing, not fresh layed fertilized eggs.
Fertilized eggs taste exactly the same. They do not develop at all unless incubated, even if you let them sit on the counter a few days. I know you are supposed to be able to see a bullseye in a fertilized egg, but honestly I don't even usually see that. There is no nutritional difference either, and egg color means nothing either nutrionally. What you feed your chickens does however.
To me store-bought eggs several months old are what sounds unappealing, not fresh layed fertilized eggs.