Don't rely on him, he's working, get a car seat yourself and enjoy giving birth.
Fwiw I think this reliance of having the dad there actually means the woman gets less and poorer care, as he is expected to run around and support you. Often this is not the case and he is not interested, or freaked out by the whole thing.
He is working to make money- it's a strange thing men do when the baby is coming. They go all "must hunt and get meat"!
Please don't let it drive a wedge between you. Don't take it personally, just concentrate on what you need to do. If he's not there, he's not going to be there- his loss.
I'm glad you have help organised as every new mum needs as much as she can get.
Start cooking batches of dinners for yourself and freeze them and enjoy your last days of pregnancy. Put your feet up and nap! Book a pedicure and a lady garden tidy up. Buy a tonne of very large sized disposable knickers and maternity pads.
Book a physiotherapist, book a lactation consultant, get a cleaner to come over and give the house a deep clean, register with online grocery deliveries, and find out where your nct classes are. Think about hiring a tens machine from boots, and a hospital grade pump to establish breastfeeding.
Best of luck with the birth. I hope it's easy and quick for you both. And that your DH makes it back in time if you feel it's important.