No mention of plus.google.com anywhere in my HTML

According to: https://www.bourncreative.com/adding-google-authorship-to-your-wordpress-site

The first thing to check to see if it’s working is to view the HTML to see if it has something like;

<link href="https://plus.google.com/....>

I’ve checked the HTML and there is no mention of plus.google anywhere

Am at a loss – Does this plugin actually work??

https://www.ads-software.com/plugins/google-author-information-in-search-results-wordpress-plugin/