什麽時候可以遞交824表讓家庭團聚呢? - same time when you file you

or any time after you file your I-485. I-824 is based on an approved petition, I140 here. if your I-485 approved, make a copy of your green card and send it to national visa center. They should send the package to China for processing and then info your relative for interview. it generally takes a year.