Adjustment of Status - I-485

Hello everyone, I have i485 interview on 30th of this month at Fresno, CA. Today I have received an email and my case status changed to document was mailed to me, the email says " Your Case Status: Card/ Document Production, On June 15, 2021, we mailed your document for Receipt Number MSC1123456, directly to the address you gave us. If you do not receive your document by July 15, 2021, please go to www.uscis.gov/e-request to request the document be sent to you. If you move, go to www.uscis.gov/addresschange to give us your new mailing address.

This step applies to applications that result in an applicant receiving a card (such as a "green card") or other document (such as a naturalization certificate, employment authorization document, travel document, or advance parole). Applications will be in this step from the time the order to produce the card/document is given until the card/document is produced and mailed to the applicant. You can expect to receive your card/document within 30 days of the approval of your application. If you do not receive your document, please contact our National Customer Service Center at 1-800-375-5283."

whats that means? I already received my appointment letter but what document they are talking about? I never go the i485 interview, this will be the first time, my PD is March 2018. I sent an email to my attorney no response yet, meanwhile I wanted to check with you guys if anyone experienced like me. Thank you