Back to work + pumping advice

Hello! I’m a FTM to a 6 week old baby girl and have been breastfeeding/pumping since day one. Initially I only pumped to start a freezer stash (I currently have about 35 4oz bags frozen), but I go back to work full time in 2 weeks and have a question!

I’ll be pumping at work obviously, and baby girl will be at daycare. I’m wondering if it makes more sense to give daycare what I pump at work the previous day, or store that in the freezer and use what’s frozen so it doesn’t get too old?

Also - if I basically go to exclusive pumping, will my supply go down? I’m terrified that might happen!

Any suggestions for the ‘going back to work - daycare feeding process’ is appreciated!