seo – Sitelink search box does not appear on Google after adding JSON-LD SearchAction to my site yesterday

I added the JSON-LD code to my site but search bar did not appear. What is the reason for this? am i doing something wrong?

 <script type="application/ld+json">
        {
        "@context": "https://schema.org",
        "@type": "WebSite",
        "url": "https://www.example.com/",
        "potentialAction": {
        "@type": "SearchAction",
        "target": "https://www.example.com/search?term={search_term_string}",
        "query-input": "required name=search_term_string"
        }
        }
    </script>

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