As with most online games, I like to see numbers behind lag I'm experiencing. I know the game shows notifications about extrapolation and packet loss by default, but not ping. How can I see my ping?
Expanding on Kevin van der Velden's answer, the "Video" options were changed in an update to allow showing or hiding individual performance stats.
After enabling "Display Performance Stats", open the "Advanced Performance Stats" section below and make sure that "Show Network Latency" is enabled.
In addition to displaying ping, the section also has options for "Framerate", "GPU Temperature", "VRAM Usage", and "Network Interpolation Delay"
Control + Shift + R is the default setting to toggle it. If you scroll down to the bottom of controls you can find an option to change it.