Adjustment of Status - I-485

I had an interview this morning. Since I didn't check the time when we walked in the IO for the interview, but I think it was about 15 or 20 minutes long. The officer asked us simple questions such as when and how we met, if I met my husband's family and where I met them, if my husband met my family and who he met, if we had a wedding here, who proposed to who, who supported me to go to school before I got married. She never asked for pictures, but she did ask for joint documents. She also asked if I had any kid in the world I don't know. Lol then turned to my husband and asked the same question. After she asked what we were planning for next year, she said everything seemed ok, but she was not the one who made the decision. She wrote down every answer we gave her to give to her supervisor and said I should be expecting a green card within 30 days, and if there is anything that they need us to fix, they will let us know in a week or so. So hopefully we don't receive any RFE. I brought his latest pay stubs but forgot to show her since she didn't ask. She took all the original papers which include joint bank statement, joint medical insurance bills, W-2s, employment letter. She only returned the marriage license, joint lease contract and my husband's divorce decree. So make sure you guys copy the W-2 before the interview.