1. You don't need a waiver package, the officer that will interview you will apply for the waiver on your behalf and they will not ask for any extra paperwork.
2. I have interviewed at Amman Embassy on the 27th of February and have entered the US on the 4th of March 2020. It took them 2 business days to approve my waiver.
3. Your case defiantly isn't eligible for expedite. Expedite is only for extreme cases like medical extreme reasons.
4. I don't know.
5. I don't know.
I don't think you need any special support for your case since nowadays almost everyone is being approved. So don't worry.
My best wishes to you and your wife.