If I want to add an hreflang tag, is this writing correct?

Is this method safe for SEO, and how to write the correct code to implement hreflang on blogger

<link href=’https://www.icloudice.com?hl=en’ hreflang=’en-SG’ rel=’alternate’/>
<link expr:href=’data:blog.url.canonical’ hreflang=’x-default’ rel=’alternate’/>

Or can you write the complete code so I can use it for my blogger template, thank you