What favicon size does iPhone's "Add to Favorites" need?

I'm following Apple's Safari Web Content Guide - Configuring Web Applications and it works as expected most of the time. But when I want to add to favorites on iPhone, the favicon doesn't show up. Is it the size issue? Or what else should I do for the favorites icon to show up? Thanks

My Code:

<head>
  <meta charset="utf-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="icon" type="image/x-icon/" href="{{ "/favicon.ico" | relative_url }}">
  <link rel="apple-touch-icon" href="{{ "/apple-touch-icon.png" | relative_url }}">
  <link rel="apple-touch-icon" sizes="76x76" href="{{ "/apple-touch-icon-76x76.png" | relative_url }}">
  <link rel="apple-touch-icon" sizes="120x120" href="{{ "/apple-touch-icon-120x120.png" | relative_url }}">
  <link rel="apple-touch-icon" sizes="152x152" href="{{ "/touch-icon-ipad.png" | relative_url }}">
  <link rel="apple-touch-icon" sizes="180x180" href="{{ "/touch-icon-iphone-retina.png" | relative_url }}">
  <link rel="apple-touch-icon" sizes="167x167" href="{{ "/touch-icon-ipad-retina.png" | relative_url }}">
  {%- seo -%}
  <link rel="stylesheet" href="{{ "/assets/main.css" | relative_url }}">
  {%- feed_meta -%}
  {%- if jekyll.environment == 'production' and site.google_analytics -%}
    {%- include google-analytics.html -%}
  {%- endif -%}
  <!-- site css -->
  <link rel="stylesheet" href="{{'/assets/main.css' | prepend: site.baseurl}}">
  {% seo %}
</head>