Last time posting here. An update:
I-751 Priority date: March 2021
Applied N-400: August 2, 2022
N400 interview scheduled: October 13, 2022
Interview: Dec 1, 2022
Oath ceremony notice was mailed: Dec 1, 2022
I-751 still showing fingerprints was taken. Status since 2021.
Brought my husband with me but IO told him to wait outside. IO went straight to the N400 questions and testing. Asked 5 questions (mainly political). He only confirmed my biographical data for I-751. Asked me if I wanted to add anything new...gave him 2021 tax return transcript, car title, auto insurance update. I asked him if he wanted more info, he said he had enough. After that, he said "congratulations...you passed the test and you're approved. Ceremony letter will be mailed in a few days". Received an update in uscis case tracker a hour later that "Oath ceremony notice was mailed". Letter was available in uscis online account.