colostrum still????

hey mamas I’m 4 days pp (had my little guy via c section early Sunday morning) and I’ve been pumping for him since Tuesday not really on a strict schedule just trying to get used to the idea (we have donor milk from someone so that’s what we are giving him now + a little formula) anyways I don’t think my milk has come in yet but I’m having a hard time knowing what I’m pumping? is this colostrum still? the reason I say I don’t think my milk has come in yet is bc my boobs are hard-ish and sore but nothing like everyone talks about?

left bag and middle bag are pumps from yesterday (multiple sessions mixed in) and right bag is just from this morning I did 4 minutes on massage mode 20 minutes on a comfortable suction.

if this colostrum, how many oz should he be getting per feeding? I would at least like to add some to his bottles so he’s still getting the benefits. thanks ladies, I’m a first time mom and questioning every single thing I do 🤦🏼‍♀️