What's an ordinary clock? Springs, Weights, SunDials, Atoms?

Time is irrelevant anyway. After all, if we can assume the Now is real, then the time it is here, is the same time every where. Right Now, it may be 3PM Earth UTC, and if I was on Pluto right now, it would also be exactly 3PM Earth UTC.

And if, by whatever method, I traveled from Pluto to Earth, in 10 minutes. It would then be 3:10 on Earth, 3:10 on Pluto, and I spent 10 minutes telling you about it.