Quick progress update (ROC was finally approved last week!):
10/4/2021 - Filed I-751 - assigned to LIN (Nebraska)
Oct 2021 - fingerprints reused
10/1/2022 - Filed N400
12/9/2022 - N400 Interview Scheduled (Chicago FO)
1/23/2023 - Combo interview at Chicago FO. I-751 part was relatively easy (wife was required to attend as well), officer asked for proof of jointly filed taxes for 2021 and nothing else. Passed the civics test but was given a notice for N-400 that case must be reviewed (apparently they had to request I-751 case files to be transferred from Nebraska).
3/10/2023 - I-751 case transferred to NBC
4/6/2023 - I-751 Approved
4/10/2023 - N-400 recommended for approval and placed in oath line
There seems to be some issue with ROC cases in Nebraska that delays approvals post N-400 interview. I was preparing to get congressman and/or lawyers involved as the 120 day deadline since N-400 interview was approaching but glad that didn't have to go down that route.
Best of luck to everyone else - looks like October 2021 filers (even with Nebraska SC) are now seeing some movement.