As a bloke, I regard his behaviour as disgraceful. Assuming he bothered to turn up to the ante natal classes (or was not giggling at the back of the class during sex ed) he will know that a baby is very likely to come out before the due date.
I have a quite macho view of fatherhood.
One's duty as a dad, is to get DW to hospital, regardless of who tries to stop you. That means not drinking at all in the run up, in case you need to drive her to hospital.
I even have an image of some drunk and/or hungover bloke stressed out and speeding to hospital. Not nice.
I hate cars, but learned to drive at 40 and bought a car because that was necessary to execute this duty.
Even though I didn't track mud over the carpets, I paid for contractors to clean the house with extreme prejudice whilst DW was in hospital, and because I'm a paranoid geekdad seriously vented the house in case the cleaning chemicals used affected a newborn.
I'd book the contractor now.
Reading the above, I fear sounding like I think I'm some sort of hero. Not so. Most dads I know have much the same view. If you want revenge on DP, then tell his mates. Most of them won't be impressed.
I'm not criticising you, but fear you missed a trick by getting a "vague promise" to be around.
Sadly, this immature twat needs management. Actually that's a common defect in Dads' position around childbrith. Women get told what they need to do. There's 100's of books, health visitors, ante natals etc, and often female relatives and friends.
Blokes get almost nothing, next time you're in a bookshop you will see 50 books for mothers and zero for dads. I don't even know if such a book exists.
You need to give him a list. Shit he needs to do. My "macho" view of fatherhood is that if you're not suffering "shock and awe" you're not doing it right.
That means he needs to understand that he is doing some graveyard shift feeds, that he needs to be "around", to do shopping, lifting, ferrying etc.
By a list, I do mean a piece of paper.