Going back to work tomorrow. How do you breast feeding mamas juggle breast feeding and working full…

Going back to work tomorrow. How do you breast feeding mamas juggle breast feeding and working full time? My son isn’t a good solids eater so I’m a little worried. I was never able to get much milk out from pumping after 3 months. It takes me all day just to get 5 oz and I’m hoping the more I do it the more I’ll get. Any advice for this mama is greatly appreciated