Lowest 46 (rare), AVG 59, highest 60,I think it is capped.
Most of the time it is between 52-60. With no OC on CPU or GPU. I have water cooled CPU and have tested up to 5 MHz on the CPU when I first built my PC 3 years ago, But I don't like to OC if its not needed. I may test OC the CPU with BF1 to see if it helps.
If the game feel smooth then I am fine. 90% of the time the game stays right on 60 FPS.
To see FPS hit the ~ key and type "perfoverlay.drawfps true"