Only if you have a very long arm, like Monkey D Luffy.

i mean on pc arm

Yes, that too.

I guess most arm devices have only Linux implemented.

It is already reality … Since quite a few years …

It’s already running on a gazillion devices.

will linux run on arm?

Millions of Raspberry Pi say “yes, it will”.

only the ARM versions

Yeah it does but it really vary from vendor, arm much locked down to what vendor do