After the green card interview, go back and wait for the notice. It may take a week to see if you need supplementary materials or something.

Let's get down to business. Congratulations on completing the green card interview. Generally speaking, you need to wait about a week before the relevant departments will inform you whether you need supplementary materials.

Why wait a week or so? This is because after the green card interview, the relevant departments need to review and compare your materials to ensure that your application materials are true and effective. If there is nothing wrong with your materials, you will receive a notice that the green card has been approved. If there is something wrong with your materials, the relevant departments will inform you that you need to supplement them.

If supplementary materials are needed, relevant materials shall be supplemented in time according to the requirements in the notice and submitted within the specified time. Usually, supplementary materials need to be submitted within 30 days, and overdue will affect the application progress.

While waiting for the notice, you can check the status of your green card application to know the progress of your application. You can check the status of green card application through USCIS official website or telephone, or you can get more detailed information through USCIS official immigration consulting service.

In short, after completing the green card interview, you need to wait patiently for the notice from the relevant departments and supplement the materials in time (if necessary). At the same time, you can know the application progress by querying the application status.