Pumping and returning to work

Unfortunately I have to return to work when my LO is 6 weeks old after Labor Day. I’ve managed to pump only 60 oz or so of breast milk and I’m worried that I won’t be able to pump enough while I’m away. I only really can manage to get like 2-3 oz at a time if that. When I return to work do you think throughout the course of the day when I’m away from her I should be able to pump enough for the next day when she is at daycare? I’m a bit stressed about the whole pumping thing and think it may be easier to resort to formula.