US Immigration from Canada

I just learned that both myself and my 7 year old need Covid19 vaccines ( done in the last 12 months) as well as seasonal influenza (flu shot) done.

Does anybody have more information on this? How strict is this? Is there any flexibility in not getting these done and proceed with medical exam?

Please let me know if children need to attend the scheduled interview? Our interview will be in Montreal but we live outside of this city.

Thank you!

Hello, we recently received an update on our I-129F case saying the following " your case was sent to the Department of State for visa processing. You can find general information on Consular Processing by visiting our website at www.uscis.gov . The website will provide information on what to do next, who to contact, and how to inform us of any changes in your situation or address."

So what does this actually mean, is it approved? Hence it is sent for visa processing? We thought it would say one of the three Approved/Rejected or Denial.

Isn't it suppose to be sent to NVC?

What are we to do next? and what should we expect in the next coming weeks/months?

Thank you~

Does all mail that comes from the USCIS and embassy go to the petitioner? Besides the visa, what other mail will come to the beneficiary? Beneficiary has had a change of address and now uses a P.O box.