Mid day should be ok.
I went at 8 am scheduled on the 12th, which had a line out the door before they were open. Some people were turned away for showing up 2 hours before their scheduled time on the same day.
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Bio Date - 02/22/18 (walked in 2/15)
Expiration - September '18
Approved - 04/09/18
Naturalized via MAVNI | April 2018