You would need the I360 for widower of USC. Consult with an attorney for guidance.

It can take 120 days post interview for decision.

Best to contact USCIS to inquire directly.

Your question is unclear. Please rephrase. Good luck.

Have you contacted USCIS about this delay?

It can take a few weeks to months for decision after documents are submitted.

You can amend this at time of interview.

Yes you may after marriage to your spouse. Consult with an attorney for guidance.

Best to obtain the police report and final disposition of case and have an attorney for guidance.

Your spouse may be outside of the US during the filing of the I130 but when the I864 is filed, your spouse must be domiciled in the United States.