I stayed home with my twins for 3 months, and returned to work after that. I wanted to have a breastmilk supply before I went back, but it was practically impossible. I was either feeding babies, had just fed babies, or was just about to feed babies! Mine always nursed at the same time, so there was never a spare breast.
I worked half days for a month when I went back to work; I was able to pump once a day for that first month, and twice a day when I was back at work full time. I never was able to pump as much as they ate, but our nanny always gave them breastmilk first, so at most they'd get s small bottle of formula in the afternoon, after they were 3 months old. I thought that was pretty good!
For now, don't worry about it. Just feeding your babies all day is enough of a challenge! As they get a little bigger, nurse for a shorter time, and go longer in between, you might be able to sneak in a pumping session now and then.
If the chips are down, the buffalo is empty.