Website Icon not visible on Google

Hello,

Please navigate to the Appearance > Customize > Site identity and set the icon for your site.

Google and all the search engines index and reindex pages with some period that can take more weeks, please give time to the search engines. It may take some time for Google to crawl your site and update the favicon on search results.
https://themeisle.com/blog/wordpress-favicon/#gref

Best Regards,