Sister's case was just approved.
Application sent: September 7
Biometrics: September 26
RFE: January 25
RFE response delivered to USCIS: January 29
Approved: March 12
California Service Center
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Self filed AOS │Apps Received By USCIS - 3/18/19
│Biometrics Done - 4/11/19
Interview Scheduled - 4/24/19│Interview Date - 5/31/19│AOS Approval - 5/31/19
Permanent Resident Card Received - 6/8/19