No they don’t request every receipt, just the tax transcript issued by IRS.

Yes you may accompany your parent to a biometric appointment.

No you must wait to become a USC to petition for a parent.

Best to consult with an immigration attorney for guidance.

Yes you should include the country you traveled to by bus.

Check USCIS case processing for accurate processing times.

Please rephrase your question as it is unclear.

More information is needed regarding your stay post the marriage-based application. Consult with an attorney for guidance.

You are eligible for the I751 with waiver once divorce is finalized.

Unfortunately expedite requests are discretionary and difficult to have approved.