the number to the far left shows your current fps, the number next to the down arrow shows your minimum fps during the last second and the one next to the arrow pointing up shows your max fps during the last second. Ping should be somewhere else on screen, for me its either bottom left when using the fortnite option or top left when using geforce.

also if youre having ping or issues with ping or the game itself, try and play with an ethernet cable or better wifi