回複：我和孩子在美國報485，老公能在中國轉身份麽？

After your I485 is approved, you can file I824 for your hu*****and to follow to join. The approve of I824 will be forwarded to Guangzhou and they will send a package to your hu*****and call package 3, then your hu*****and send it back. After that, he will be noticed to interview and get an immigration visa.
I don't know whether you can apply I824 before your I485 is approved. I don't know how long it will take in Guangzhou. There rarely any example in the Internet.
I would suggest you find a good lawyer who has experience on Following To Join case.
Please share your progress if possible, thanks.
The botten line is that your hu*****and doesn't wait for a long time which happens if the marriage after one of the spouse get Green Card.