I'd be thinking of a back up...having DH around waiting could be potentially quite a frustrating experience for all involved...like a watched pot that never boils lol. Thankfully you have the first time birth card and that in very general terms can mean that labour is a steady length and given your scenarios he would stand a good chance of getting there in time (even if he meets you at the hospital as my DH did). BUT, in the unlikely even that he doesnt get there in time (i like to think positive!), you could organise for a video to be done, or even to have an extra support person that can video call him if you have the technology (i'm thinking face time or something).