You can switch to grower/all flock now or soon-ish, if you want.  Or continue to keep using the starter feed.  Once they start laying you can switch to layer if you want, or continue with grower/all flock with calcium on the side.
I don't do things by number, I do things by "when I run out" so if you still have plenty of starter left (but want to switch to grower or all flock), continue using it until you run out.