Markup can be conveniently checked by way of schema markup screening tool. It will take a while for rich snippets to look in search results, so they may not be shown instantly. Nonetheless, product and class rich snippets will show up only immediately after Google indexes the articles. I'll update https://addons.prestashop.com/en/seo-natural-search-engine-optimization/31857-automatic-google-rich-snippets-json-ld-open-graph-seo.html