Heat the nozzle to 200c and bed to 60c and wait for the temperatures to stabilize. Remove any filament that is stuck to the nozzle.

If you have independent axis leveling configured make sure you run. Home all axis.

Jog the nozzle to the center of the bed. If using my github config, move the hotend X-40 so the nozzle is in the center of the bed.

Place a piece of paper under the nozzle.

A lot of times when calibrating Z offset the bed can't move up high enough because we don't have it configured to allow Z to go past 0. Out of habit when calibrating Z offset I will send G92 Z15 which tells the printer the new Z position is Z15. This will give me more than enough to calibrate the Z offset now.

In the console enter

M558 P9 C"^zprobe.in"

G31 P500 Z1.0