It is great that your DHs want to be involved in caring for your baby, but as Janet has pointed out, there are many ways to do that and take the pressure off you without requiring the extra work that comes with pumping, sterilising, storing, etc for expressed milk.

We had planned to do this before my DD was born, but she ended up being a great bfer and it was much more efficient for me to bf her myself and let DP take her to 'play', or better still - change and bath her. I ended up only expressing for comfort and always had plenty in the fridge/freezer 'just in case'. It ended up being used with her rice cereal when she started on food.