I've had a family vacation booked for August 4th (Oath on 31st) driving to the US. I have a US passport, and should have certificate by then, but a passport doesn't seem likely. I sent an inquiry and haven't heard back, but when I lost my PR card, they said driving across or getting to a border - agents would be able to verify I have a right to be here. It was more getting on a plane from a visa country that would be challenging (lucky to have US passport I was told).
I assume I won't have any issue, but I also don't want to waste $110 on a next day passport if it's not needed. I will happily get when I'm back, and then I've got Nexus appointment in November finally. Just bad timing, but I can let you know if I hear back.