Breastfed Babes

Danielle • Dated my husband since December 2006 and we were married May 2016. Baby boy Henry born June 2nd 2017 👶🏼💙
Hi ladies! :) 
My son is 3 weeks old tomorrow and I have been breastfeeding him and pumping occasionally to build a supply for my freezer. I haven't been able to build a large supply yet just a few ounces here and there but I know he's getting enough because he poops 6-7 times a day and pees 8 or more, he is gaining weight when he goes to his checkups. My question is: 
Do breastfed babies ever sleep well through the night at some point? 
And when should I start to expect being able to fill my freezer with frozen milk/producing more for that?