If you get your chicks now, you can look forward to eggs come September. It really depends on the breed. Leghorns start at about 18 to 22 weeks, Black Sex Links at about 16 weeks, but most around 24 weeks or so.
My Delaware and Dominique started at week 21.
Barred Rock, Easter Egger, and White Cochin (way early for a Cochin) at week 22.
The Wyandottes at week 23 & 24.
Black Copper Marans at 24 weeks.
Buff Orpington & Silver Cuckoo Marans at 27 weeks.
Blue Cochin at 28 weeks.
Australorp at 29 weeks.
And my Ameraucana didn't start until week 33.
Time of year may impact when they start as well as daylight hours change. I even had supplemental lighting in my coop, and my Ameraucana, who is supposed to be a "moderately early" maturing hen, took forever to start.