I140 Inquiry result

Hi,

My CSC LC based EB2 I140 is two months behind the current processing time.
my lawyer sent a email two weeks ago to CSC to inquir my case.
CSC return a email and said

"This case is pending supervisory review."


What does it mean?
How long will they start to process my I140?

If someone has same experience before, please share your information.

Thanks