Yeah the breast pump comment is a bit far and making a lot of assumptions! I'd definitely be keen to get some boundaries in place ready. Agree with Erica, along the lines of you're glad she's excited about helping, but it should be led by you what and when you want help with. I breastfeed and express and honestly, it's easier for me to just feed her, I only leave an expressed bottle if I'm away from my baby, otherwise the time I'd spend sat feeding her, I'd still have to sit and pump for someone else to feed her, so it's not really "helpful". The help we actually wanted from family especially in the early days was bringing shopping and food and holding her for a bit so we could sleep and shower!
Start setting boundaries with both of them. You could tell him that you love how excited she is but it’s a bit overwhelming for me. Make a list now of what you are ok and not ok with and get your husband used to it because once you are postpartum the mixture of the hormone drop and extreme tiredness may make it hard to advocate for yourself.