One of those might do it (the latter one). There are multiple ways you should do it though to cover all kinds of browsers. There's a site that generates all the markup for you. I'll try to find it and post the link.

https://stackoverflow.com/questions/5110776/apple-touch-icon-for-websites and https://mathiasbynens.be/notes/touch-icons have some more info though.

http://iconifier.net/ generates all the thumbnail sizes for you.

This one generates the thumbnails and shows you what markup to use. It's not the one I'm trying to find though. https://manytools.org/http-html-text/apple-touch-icon-generator/

I don't know if any of this will work with Chromium-based Opera. You'll have to try.