Just me again, sharing my routine update in case anyone is facing a similar situation and interested in post-interview timelines:
122 days since the interview and still no update
63 days since last update to the API
First Congressman Contact:
46 days since reaching out to congressman's office (assigned to case worker)
22 days since case worker reached out for more information (shared same day)
"Please provide me a copy of the receipt notice for your USCIS cases. This is needed to verify that we are contacting the correct service center on your behalf."
14 days since I followed-up with the case worker for any update
No response
Second Congressman Contact:
39 days since reaching out to congressman's office (assigned to case worker)
No response
Third Congressman Contact:
13 days since reaching out to congressman's office (assigned to case worker)
11 days since case worker reached out for more information (shared same day)
"In order to follow-up, your wife must complete and return the attached release form with receipt numbers and an explanation of the issue in the description on the actual form. If there are any USCIS receipt notices please include them. Be sure to have her hand sign the form as USCIS does not accept digital signatures. For an expedite request you will need to also include a letter explaining the reason for expedite plus supporting documentation per USCIS expedite criteria"
Note: When I originally filled out the form I had my wife sign it with wet ink, but used my email and wrote the description of the issue from my PoV (US Citizen), so I think this is why he asked for it to be re-done.
10 days (today) since case worker confirmed receiving everything and "will follow up and be in touch"
3 days since I followed-up with the case worker to see if there was any update (he responded same day):
He said, "Nothing yet. USCIS is backlogged with congressionals so it is taking some time to get a response. As soon as we have an update we will be in touch."
I asked, "Do you happen to have a rough ballpark of how long responses are taking for other congressional inquiries you’re handling?"
He said, "USCIS can be pretty inconsistent but 30 days is average."