Need advice on pumping!

Hi everyone! First time mom here... My beautiful daughter was born in October 23! I am exclusively breastfeeding and feel super lucky that she took to it right away. I'll be going back to work in about 4 weeks. I know they recommend waiting 4 weeks to start pumping which would give me another 2 weeks until I can start pumping. My question is... When do I pump?! I want to still feed her from the breast but I need to build up a supply for when I'm back to work. Any and all advice and/or tips would be greatly appreciated! Thanks in advance!