3rd step 給他遞交1-130,我的理解對嗎?
-Yes.
他拿到移民approval,大概需要等一年嗎?
-Normally yes, but sometimes it may take more time, especially due to Covid.
他在國內等待approval期間,不能入境直到拿到approval,對嗎?
-He probably cannot enter US using B2 visa due to immigrant intent. He needs to apply for the immigrant visa to come to US after your I-130 is approved. Nationa Visa Center will contact you and send you the instruction for the immigrant visa application after your I-130 is approved.
You may visit him when the Covid situation decrease in China and US during this period.