You can do that, but just watch to make sure you aren't creating an oversupply problem, which can bother some babies quite a lot.
Bear in mind you do NOT need a big freezer stash to go back to work. You just need a couple days' worth for the first few days while you get settled into pumping at work and in case you spil it or forget it at work. You should be able to pump what baby needs for the next day while at work. Most BF babies take 1 to 1.5 oz per hour of separation. Save any overage for your stash.