there is no A# on my form 797 (approval notice )

about J waiver. is it important? or any affect on my Form 485 applicaitno?

2. i called USCIS about the typing error for my name. But I did not rememer my A# when the person asked for my A# becasue A# was not on my J approval notice (Form 797). They recorded it as N/A, is it ok?

3. I got the refer number, which specific site can i check the status? I did not find at USCIS website.

Thanks very much in advance