My sister, a citizen, helped me apply for immigration to the United States, and it has been approved.

What do you mean by "passed in America"?

Immigration accepted your case?

Then you have to wait about ten years.

Your schedule has arrived? Did immigration notify your sister?

Then, your sister will start to prepare the materials she submitted, and so on.

Your materials were transferred to Guangzhou, and Guangzhou began to investigate your background.

After three or four months, if you pass the inspection, Guangzhou will send you a letter.

Just prepare carefully according to the requirements in the letter.