Well fed and managed, they will lay when they are mature enough. Large fowl, late fall maturing, may take a few weeks longer than you expected. Listen for the "singing", change of voices. Eggs will be along in a week or so! When the first pullet lays, the others will follow shortly. Fall and winter pullets usually do not need longer daylight to start their first laying session, so should not need an early morning light in their pen, but it is always an option. Do they have nice nest boxes ready? Sometimes in spite of that, first egg may be on the floor of the coop. Patience......cockerels crow...pullets lay eggs....and sometimes a good talking to, seems to help!!!!!!.