Ah, I thought you'd submitted much more recently. Yep, 4-5 months for a US applicant is not that unusual, esp where marriage reasonably established. This is why I was cautious about how long OWP might take - for some applicants with straightforward cases the PR status does get approved/finalized before the OWP gets much of anywhere.The offical submitted date on the AOR said Nov 30/24. When he was asked for biometrics, medical & extra paperwork, he did submit everything very quickly, which probably helps.
As noted, when he sends that in and gets the response back with the printed COPR, he's good to go and can 'land' whenever convenient. Note that when he does he should give them info about goods coming separately, and if he's bringing his car, well, I've not much idea how that works (apart from that it's complicated).