Current Priority date for EB3 is Aug 1, 2016. PD is the date when documents reached to USCIS when PERM is filled. Even PERM approval takes 4 months and PD moves accordingly, it wont delay much.
For eg, My perm was filled on Sept and approved in Dec. Which makes me just a month behind that EB2. If that makes sense.
So the bottom-line is if your company is willing to file for GC, go ahead and do it and hang on there for a year or so.