Based on your specs provided, you could expect to see 50-60 FPS in uncrowded areas on full graphics. Certain zones will drop to 40 FPS even with low crowds. In crowded towns, you could expect to see 30-40 FPS.

In incredibly congested areas, you can expect 18-25 FPS on full graphics (e.g. S-rank hunts.)

These numbers are based on 1080p resolution & full screen.