Depends on the breed.
For heavy breeds,' B, Rocks, R, Red's, 2 &1/2 to 3lbs. for fryers.
If you have light weight layers like White leghorns, Cook these down and strip down to use in stew or the like. Light weight and game type, "bantams and fighting breeds" are not the best eating as for frying.
If you plan to keep hens for laying, the second year is when you get your bonus. You raise a new batch and after your old ones molt and start back to laying, then you can cull the old ones. These are your (bakers and roasters).
Some may say, why butcher a layer? you want tenderness. You will not get this in a molting hen.