I don't think you are saving anything by such manipulations.
A plugged in psu will always be getting some trickle power.
That is how it can respond to pressing the pc power button.
When you unplug the ups from the wall, the psu will get that trickle power from the ups battery.
Whenever you again plug in the ups, that slightly drained battery will draw extra power to charge it up again.
This power is very small so I imagine you can't tell the difference.
You could measure wall power and usage with a kill a watt meter:
https://www.amazon.com/P3-P4400-Ele...ocphy=9011564&hvtargid=pla-306572288073&psc=1
I might suggest, for convenience that you leave all plugged in and use sleep to ram.(no hibernate)
sleep puts the pc and monitor into a very low power state, not much different from full power off.
The benefit is that sleep/wake happens in a handful of seconds and will use less power than a full power off boot.