Generally advised to BF exculsively for the first 6 weeks to get your supply in properly and to help prevent nipple confusion or preferring the bottle if you have a too quick flowing teat and therefore your LO doesn't have to work at all to get milk from it. If this happens it can make establishing BF'ing hard work.
The odd bottle would be fine but I'd not express on a regular basis too often before your LO is 6 weeks old. Often expressing gets nowhere near the same amount of milk from your boobs as a baby can so its not a good indication you are making enough milk.
Also in the early weeks LO will want and need to feed little and often and chances are you won't really have much time to express often.
Lots of other ways your OH can be involved in those early weeks. Bathing, cuddles, nappy changes.... my OH loved the cuddle time between feeds when I would go nap for an hour or two before the next feed. The waiting for milk supply to settle down happened and OH was able to give LO the odd bottle of expressed milk. However he admitted to me he didn't really get much out of feeding LO and preferred to cuddle and spend time with him that way. He gave occasional expressed feeds after this but I never pressed and things were fine. In all honesty, during the night when LO as hungry it was easier to have LO in bed with me and feed him myself than it was to wait for OH to wake up (or for me to wake him
), hear him stagger downstairs, warm up the milk, bring it upstairs and get LO ready to feed. I never slept through him feeding LO as often LO would fuss or cry and he'd need my help anyways. So I just stuck to boob feeding
ill be more than happy
