3rd step 给他递交1-130，我的理解对吗？
-Yes.
他拿到移民approval，大概需要等一年吗？
-Normally yes, but sometimes it may take more time, especially due to Covid.
他在国内等待approval期间，不能入境直到拿到approval,对吗？
-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.
