Breastfeeding and pump

I’m a breastfeeding mom My baby is 2 months old and in 3 days I have pumped 18 ounces, throughout the day baby has a morning bottle with formula and a dinner bottle about 5pm with formula. Throughout the rest of the day he’s on the boob. Does pumping 18oz in 3 days mean I have a good milk supply? Or is that low?

When baby has my boob I catch the other side with a milk hacker and leak anywhere between 2 ounces.

I have bagged the 18oz and put it in the freezer.

Baby only drinks 5oz of the formula so I’d assume about 5oz of breast milk.