Congratulations to you both for having such an enlightened marriage! I am sure you will be able to negotiate new, mutually acceptable terms for the situation you are now in.
My husband and I agree that when he is gone at work, I too am "at work." (Actually, in the mornings I am; I work part-time.) When he comes home, then we are both no longer "at work," and all evening home & family duties are shared.
This means I do more stuff around the house than he does -- in the afternoon while he is at his office, I'm doing errands, laundry, appointments, phone calls, clean up, etc. But once he comes home, we share duties.
I'm in charge of birthdays and parties, cooking, laundry, cars, and yard. He's in charge of paying bills, finding babysitters, planning our social lives, and washing dishes. We both do grocery shopping on different days. We both keep the house neat and put things away; we get a cleaning service in once every two weeks.
Nothing annoys me more than husbands who think that because they work outside of the home, they get to hang out and watch tv all evening, but fully expect their wives to be on duty and working 24-7.