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Right away. Males look completely different from females right out of the egg. That's the whole point of sexlinks. Males are barred, females are not.

For black sexlinks, you can tell the difference at hatch. Males hatch with a spot of white on the back of the head, indicating the presence of the barring gene. Only the males can inherit that gene.

Feathering rate has nothing to do with gender. Male specific feathering develops at about 10 weeks, and take several more weeks to be clearly visible.

The coloring is 'linked' to the sex. That's why they are called sexlinks. Males are black at hatch, with a spot of white on the back of the head. They feather in black with white stripes. Females are black at hatch, some may have a bit of white on the throat or chest. They feather in black with...