My GC arrived today! WooHoo @MrsK called it - before Christmas, you were right. Looks like our interviewer approved our case the same day we interviewed.
My online status hasn't changed from "Interview is Scheduled", so in case anyone is worried about their online status - it could be that the online status is delayed. Stay positive.
Stay strong peeps, your time will come!
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Green Card application sent: 3/30/17 (Receipt Letter: 4/10/17)
Biometrics: 4/14/17 (letter) & April 24, 2017 (appointment)
Interview Date: 12/13/17 (Letter received 11/10/17)
Green Card approved: 12/13/17 (Letter received 12/18/17)
Card Arrived: 12/22/17!!!!!