Milk supplies storage.

Hey ladies, my son is 3 weeks old and I’m a exclusively pumping mom. I wish I could enjoy breastfeeding like most mothers do, but I don’t so pumping it is. My concern is that my milk supply will dry out by three months just like my first born. At the time I was a first time mom and didn’t store any frozen milk. Below is a picture of how much milk I already store and I’m worry it not enough. I know it only been three weeks, but I’m stressing out and worry. Any ladies who have more experienced please give me some advice, I would really appreciate it.