Markup may be conveniently checked by way of schema markup screening Resource. It will require some time for rich snippets to seem in search engine results, so that they is probably not displayed immediately. On the other hand, product and category rich snippets will look only just after Google indexes https://addons.prestashop.com/nl/seo-zoekmachineoptimalisatie-vermelding/31857-automatische-google-rich-snippets-json-ld-opengraph-seo.html