The EU (and maybe China?) have been regulating standby power consumption, so most of my appliances either have a physical off switch (usually as the only switch) or should have very low standby power draw.
I don't have the equipment to measure this myself.
By "off" you mean, functionally disabled but with whatever auto-update system in the background with all the radios on for "smart home" reasons - or, "off"?
What's the margin on unplugging vs just powering off?