Call of Duty: Warzone 2: This game can be demanding, but the RTX 3060 is a capable GPU for it. You can expect good performance at 1080p with high settings. For 1440p, you might need to adjust settings to maintain smooth gameplay.
This is correct, Warzone 2 is heavy on the CPU and would explain the GPU not being fully utilised. Increasing image quality settings (or display resolution) would increase GPU utilisation.
The best Vanguard FOV settings sit around the 100 to 105 mark. While this comes down to personal preference, these settings offer the biggest advantage without negatively impacting gameplay.