Assuming you are right about the breeds:
The Barred Rock might be sexable now (males have more white than females, at all ages.)
For the Salmon Faverolle, if it grows black breast feathers it is male, if it grows pale breast feathers it is female. There are color differences in other parts of the body too, so someone knowledgeable (not me) might be able to tell already by looking at photos of that one.
The others probably need to wait a few more weeks before they can be reasonably sexed from photos.