Add Featured Post on Custom Post Type (With AJAX)

functions.php

<?php 

/**
* At the default, this is will add 'featured' meta post on the 'post' post type, to adjust it with your need
* use your IDE editor and use search & replace from your IDE to replace 'featured' & 'post'
*/

/**
 * Register the 'Featured' meta box.
 */
function add_featured_meta_box() {
    add_meta_box(
        'featured_meta_box',
        'Featured',
        'featured_meta_box_callback',
        'post',
        'side',
        'default'
    );
}
add_action('add_meta_boxes', 'add_featured_meta_box');

/**
 * Display the 'Featured' meta box.
 */
function featured_meta_box_callback($post) {
    $featured = get_post_meta($post->ID, 'featured', true);
    ?>
    <input type="checkbox" name="featured" value="1" <?php checked($featured, 1); ?> />
    <label for="featured">Featured</label>
    <?php
}

/**
 * Save the 'Featured' meta box data.
 */
function save_featured_meta_box_data($post_id) {
    $is_featured = array_key_exists('featured', $_POST) ? $_POST['featured'] : 0;
    update_post_meta($post_id, 'featured', $is_featured);
}
add_action('save_post', 'save_featured_meta_box_data');

/**
 * Add the 'Featured' column to the admin list view.
 */
function add_featured_column($columns) {
    $columns['featured'] = 'Featured';
    return $columns;
}
add_filter('manage_edit-post_columns', 'add_featured_column');

/**
 * Fill the 'Featured' column in the admin list view.
 */
function fill_featured_column($column, $post_id) {
    if ('featured' === $column) {
        $featured = get_post_meta($post_id, 'featured', true);
        $nonce = wp_create_nonce('update_featured_meta');
        echo '<input type="checkbox" class="featured_checkbox" value="1" ' . checked($featured, 1, false) . ' data-post_id="' . $post_id . '" data-nonce="' . $nonce . '">';
        echo ($featured == 1) ? '<span class="featured-text"> Yes</span>' : '<span class="featured-text"> No</span>';
    }
}
add_action('manage_post_posts_custom_column', 'fill_featured_column', 10, 2);

/**
 * Create nonce field for the 'Featured' meta.
 */
function featured_meta_nonce_field() {
    wp_nonce_field('update_featured_meta', 'featured_meta_nonce');
}
add_action('add_meta_boxes', 'featured_meta_nonce_field');

/**
 * AJAX handler to update the 'Featured' meta field.
 */
function update_featured_meta() {
    // Check for nonce validity
    if (!isset($_POST['nonce']) || !wp_verify_nonce($_POST['nonce'], 'update_featured_meta')) {
        wp_die(__('Invalid nonce', 'text_domain'));
    }

    // Update meta and return the result
    $post_id = $_POST['post_id'];
    $featured = $_POST['featured'];
    update_post_meta($post_id, 'featured', $featured);
    echo ($featured ? 'Yes' : 'No');
    wp_die();
}
add_action('wp_ajax_update_featured_meta', 'update_featured_meta');

/**
 * Add an AJAX script to handle column update in the admin.
 */
function add_featured_column_ajax_script() {
    if ('edit-post' !== get_current_screen()->id) {
        return;
    }
    ?>
    <script>
    jQuery(document).ready(function($) {
        $('.column-featured').on('click', '.featured_checkbox', function() {
            var $this = $(this);
            var post_id = $this.data('post_id');
            var featured = $this.is(':checked') ? 1 : 0;
            var nonce = $this.data('nonce');

            $.ajax({
                url: ajaxurl,
                type: 'POST',
                data: {
                    action: 'update_featured_meta',
                    post_id: post_id,
                    featured: featured,
                    nonce: nonce
                },
                success: function(response) {
                    $this.closest('td').find('.featured-text').text(response);
                }
            });
        });
    });
    </script>
    <?php
}
add_action('admin_footer', 'add_featured_column_ajax_script');