How much should I have stored?

Stacey • Mommy to a 1 year old🎀. Expecting #2 in January!
My little one is two weeks old. I have been pumping to try and build my stock pile, but I also nurse him once or twice a day. I try to keep a days worth of milk in the fridge at all times and I have just over 200oz in the freezer. Is this's good start? Should I be pumping more/less? I'm pumping every 3-4 hours for 15 min. My goal is to have enough stored so I can stop pumping by the time he's 7 months old.