My wife was single when she got EB3 visa. She and I are both still in home country and she is traveling to US next week which means she is not PR yet. She becomes PR upon endorsement of her visa (which I understand happens at port of entry upon arrival to US). Her DS260 is locked and we have not added my details as family member. We have mailed Embasy but no response for 2 months. What should we do? Please advise. I have been told my process will be faster if she files for derivative beneficiary prior to leaving home country. How can we do that. We are worried we’ll have to live apart for a long time.