GC timeline for EB3

Hi,

Can I know how long does it take to process EB-3 GC at the moment? How do we know when it will be approved? I filed the I-485 last year. I got biometrics appointment in Dec last year. It has been 4 months and I still not heard back anything. I talked to my attorney and they said USCIS has a big pile of backlogs so I need to wait without giving an average of how many months I need to wait.

Best,