Please add a new post with a link back to refer to this one rather than bumping up an old thread from 2017.
This feature is not available through Wix Stores and you can request it here.
https://support.wix.com/en/article/request-selling-in-multiple-currencies-in-wix-stores
https://support.wix.com/en/article/request-additional-currencies-for-wix-stores
Although it is possible to do yourself as shown in these YouTube videos from Shan (Corvid Master)
Wix Multi Currency Store - Wix Code - Product Showcase - Dude Lemon Mauritius
How To Make Multi Currency Online Store | Wix Code - Dude Lemon Mauritius
However you would have to make up your own store setup and everything that goes with it completely from scratch.
You can contact him here if you want more info on this.
https://www.dudelemon.com/