If you're planning on storing OS no biggie but if you're storing feed, caution. Sales are great for savings but unless you got a good storage plan & weather conditions ... Feed mites, molding & mildew will make it more expensive to buy on sale. I've learned that lesson.
For reference, that is day 130, or 18 1/2 weeks for my mixed flock. I don't expect all to start laying within the next few weeks as some of the breeds take about 8 weeks longer than my earlier layers.