We flew into JFK on the 1st October, the first day of the shutdown, the impact of that hadn't kicked in.
Unusually for JFK it was quite quick, 10-15 minute queue to get to the kiosk, and after the usual 'what is the purpose of your visit' and the obligatory photo check we were through in only a couple of minutes. Although for some reason my fingerprints were checked, yet my daughter wasn't, and she's over 21.