Google Sitelink Search Box Activation

I am using WordPress as my CMS and trying to implement Google sitelink search box with Google custom search. Below is the code that I am using on my website:

<script type=’application/ld+json’>{“@context”:”http:\/\/schema.org\/true”,”@type”:”WebSite”,”url”:”http:\/\/mycompany.com\/”,”name”:”MYCOMPANY”,”potentialAction”:{“@type”:”SearchAction”,”target”:”http:\/\/mycompany.com\/?s={search_term}”,”query-input”:”required name=search_term”}}</script>

It’s been almost 2 weeks since I have implemented this code, but the search box is still not visible in the search results. Could you please help me sort out this issue? Any help is highly appreciated.