Going back to work..pumping?

Michelle • Baby 💗 born 6/11/17 & 💗 born 8/27/19

Hello. My maternity leave is quickly coming to an end. I go back early September. I'm an exclusive pumper. I've been pumping 4 times a day. When I go back to work ill be unable to pump at work. I work at a small extremely busy dental office. I'll only be able to pump twice a day in the morning and at night. Is this enough to keep up my supply? I do supplement with formula when needed. Thanks!