Exclusively pumping mamas

I am 3.5 weeks post partum and I pump every 2-3 hours I never go past 4 hours without pumping since I rarely offer the breast to baby. I may breast feed 1x daily just because of convenience. Other than that I give him the bottle. I pump about 24 oz daily, he eat 2oz per feeding and eats every 3 hours so he probably eats 16-18 oz give or take. Is 24 oz a good enough supply for me to pump? I have about 16-18 [6oz] bags in my freezer at the moment. I am just worried about my supply since I am going back to work and I exclusively pump and everyone tells me pumping isn't as good as baby breastfeeding but this is just what works best for us both.