Hi,
Google has stopped sending the exact Referrer when visiting your site from Google Search years ago.
So all that Matomo (and every other software) can detect is https://www.google.com/ with no way to find out the search query.
Google shows a report about the search queries used to find your website on https://search.google.com/search-console/about and you can use Search Engine Keywords Performance - Matomo Plugins Marketplace plugin to import this data (and the equivalent from Bing) into Google.