Pumping to Induce- Harvesting Colostrum

I've been pumping to try induce labor (I'm 38 +3) or at least help to move things along a little (last night I was only 1.5 cm dilated, cervix still hard, and baby in -2 station). Today when I pumped I got 4 oz (2 oz from each breast), the last few days I've gotten one ounce from each breast. With my daughter I had an oversupply that allowed me to also feed another baby full time; however I have been told that pre-birth leaking is no indication of supply. I've been putting it into 2 oz portions and freezing, I currently have 12 oz in the freezer.

I'm curious for those that are pumping to try to induce labor how much milk you are getting out?