... and the "Workers->Shift Graph" shows how far you've gone so far.

The green area/red line is 5Nd
Your blue hash rate line, from the right shows how far along that is getting back to the 5Nd on the left.
(time forward travels from left to right)

The Red line is close to what hash rate you'll be rewarded at if we found a block now.

Each new shift adds on the right, and an old shift falls off the left.
If that amount added is greater than the amount that drops off the left, your red line will move up.
Obviously if you are zero on the left, it will keep moving up until your green area is full.