The BV you received will have the exactly the same criteria/limitation as of your existing (489) visa. So, moving under 489 and BV would have the same impact. Hence, the question really should be whether you should move before your 887 grant or not.
You didn't mention which state are you in, as different states demand differently. For example,
Skilled and business migrants seeking to move to South Australia can support their visa application by applying for state nomination.
www.migration.sa.gov.au
liveinmelbourne.vic.gov.au
So, theoretically, if you are in VIC, you should remain in the regional area until you get 887 grant. If you are in SA, you can move (assuming you have passed 2 years as you have already applied for 887).
Practically, well, not clear how strictly states enforce this especially after someone applies in 887.