Date of I-751 Mailing: 5/11/2018
Received by USCIS: 5/14/2018
NOA1 Date: 6/8/2018
Bio Appt Date: 5/22/2019 (after being waived in Feb)
Case Transferred: No
Interview: No
Approved: YES 5/23/2019 (1 year, 12 days later)
Our case was one of the "lost" cases where neither the old website, new website or USCIS tracking app was ever updated and we never got any sort of electronic notifications. Glad that is over with!
Congrats to all that are moving forward and best wishes to those still in the system.