You can transition them to a layer feed, or an all-flock feed, which is a better choice, IMO. With oyster shell in a separate dish out there.
Always check the mill date on each bag of feed, and buy within a month, and use it up within a couple more weeks. Some vitamins don't store well, so fresh is always best!
If you only have two birds, buy the small bag of feed!
With a mixed flock of youngsters, laying hens, molting birds, and roosters, I feed Purina Flock Raiser, 20% protein, with oyster shell in another container for the laying hens.
Find a diet that's always fresh where you shop!
Mary