CSS path in category pages

Try this in your child-theme style.css

.entry-meta {
display: none;
}

If you rt-click on the page and select Inspect, you’ll see your HTML for the page. Look at the body tag and you’ll see a list of classes that can be used. There should be one like cat-mycategory and page-id-99

So you can limit @questas selector by adding .cat-mycategory or .page-id-99 in front of .entry-meta ie

.cat-mycategory .entry-meta {
display: none;
}

Link to your site would be useful