It takes anywhere from 1 week to about 2 weeks time, to see the status changed after the FP is done.
You should see the status change for your 485 to something like this:
On xyz date the results of your fingerprint review for your I485 Application to Register Permanent Residence or to Adjust Status were received, and processing has resumed on your case. We will mail you a notice if further action is needed, or when a decision is made.
