Markup might be easily checked through schema markup testing Instrument. It takes some time for rich snippets to seem in search results, in order that they will not be shown immediately. Nevertheless, product and class rich snippets will seem only right after Google indexes the content. I will update module https://addons.prestashop.com/es/seo-posicionamiento-buscadores/31857-google-rich-snippets-automatico-json-ld-opengraph-seo.html