Markup may be easily checked by using schema markup tests tool. It will require some time for rich snippets to appear in search engine results, so that they is probably not exhibited promptly. Nevertheless, product and category rich snippets will show up only right after Google indexes the content. Disclaimer: https://addons.prestashop.com/de/seo-suchmaschinenranking-optimization/31857-automatische-google-rich-snippets-json-ld-opengraph-seo.html