ICX ERC20 token to ICX mainmet

Good morning,

I just discovered by chance that icx icons are no longer managed in the ethereum blockchain…
and I remembered that on my old computer, in my metamask wallet, I had icon erc20.
I would like to know if I can add them to icx main met and if, will they have the same value as on erc20? will there be a lot of fees?
A detailed tutorial on how to make the change?

Thanks