Notify National Visa Center as soon as the file is transferred to them.

No, you will do not have any recourse to CIS's delays.

if you do not have a work permit, you cannot work in the U.S. remotely for a foreign employer.

It is possible that they consider it to belong to the employer who filed it. Have them request it.

There is no harm sending the attorney or employer more documents than they need. They can decide which ones to use.

It is not likely to be an issue, but anything is possible.

You could try filing a petition for writ of mandamus with the federal court.

No doubt it depends on your immigration status. Speak with an immigration lawyer for further information.

Check if perhaps the child is a derivative U.S. citizen. If not and you do not get the card after one year, try filing form I-90. Request help...

There is nothing you need to do. The visa ceases to exist once it has been issued and used to immigrate to the U.S. So terminating an already...