On the 90th day, I make an appointment. The earliest day on infopass is 5 days later on Friday, so I make that appointment, and print out the sheet confirmation with the barcode.
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On Friday
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I went to the line at 10:00am for my 10:30 appointment. The guy at the door says you can't come in yet, come back 15 minutes later. That means even if you come really early before your appointment it is pointless. It is best to come 15 min before.
Each month, the Visa Office subdivides the annual preference and foreign state limitations specified by the INA into monthly allotments based on totals of documentarily qualified immigrant visa applicants reported at consular posts and CIS Offices, grouped by foreign state chargeability, preference category, and priority date.
All USCIS offices worldwide are open. Activities continue despite Government Shutdown.
On the other hand The State Department had this announcement to make