Add Featured Post Selection Option for Default Post type in WordPress

<?php

/* code to add featured post option to the default post type */

function add_featured_meta_box()
{
    add_meta_box(
        'featured-meta-box',
        'Featured Post',
        'featured_meta_box_callback',
        'post',
        'side',
        'default'
    );
}
add_action('add_meta_boxes', 'add_featured_meta_box');

function featured_meta_box_callback($post)
{
    $featured = get_post_meta($post->ID, '_featured_post', true);
?>
    <label for="featured-post">
        <input type="checkbox" name="featured-post" id="featured-post" <?php checked($featured, 'on'); ?> />
        Mark this post as featured
    </label>
<?php
}

function save_featured_post_meta($post_id)
{
    if (defined('DOING_AUTOSAVE') && DOING_AUTOSAVE)
        return $post_id;

    if (isset($_POST['featured-post'])) {
        update_post_meta($post_id, '_featured_post', 'on');
    } else {
        delete_post_meta($post_id, '_featured_post');
    }
}
add_action('save_post', 'save_featured_post_meta');

// Add custom column to post listing
function add_featured_column($columns)
{
    $columns['featured_post'] = 'Featured Post';
    return $columns;
}
add_filter('manage_posts_columns', 'add_featured_column');

// Populate the custom column with the editable featured post status
function display_featured_column($column, $post_id)
{
    if ($column === 'featured_post') {
        $featured = get_post_meta($post_id, '_featured_post', true);
        $star_icon = ($featured === 'on') ? 'fas fa-star' : 'far fa-star';

        echo '<span class="featured-star ' . esc_attr($star_icon) . '" data-post-id="' . esc_attr($post_id) . '"></span>';
    }
}
add_action('manage_posts_custom_column', 'display_featured_column', 10, 2);

// Add JavaScript to handle the star icon click event and update post meta
function featured_column_js()
{
?>
    <script type="text/javascript">
        jQuery(document).ready(function($) {
            $('.featured-star').on('click', function() {
                var post_id = $(this).data('post-id');
                var featured = $(this).hasClass('fas fa-star') ? 'off' : 'on';

                $.ajax({
                    url: ajaxurl,
                    type: 'POST',
                    data: {
                        action: 'update_featured_status',
                        post_id: post_id,
                        featured: featured,
                    },
                    success: function(response) {
                        location.reload();
                    }
                });
            });
        });
    </script>
<?php
}
add_action('admin_footer', 'featured_column_js');

// Ajax handler to update post meta when star icon is clicked
function update_featured_status()
{
    $post_id = $_POST['post_id'];
    $featured = $_POST['featured'];

    // For Multiple Featured Post  
    /*
            if ($featured === 'on') {
                update_post_meta($post_id, '_featured_post', 'on');
            } else {
                delete_post_meta($post_id, '_featured_post');
            }
        */

    // For Single Featured Post 
    if ($featured === 'on') {
        // Remove featured status from all posts
        $args = array(
            'post_type' => 'post',
            'meta_key' => '_featured_post',
        );

        $featured_posts = get_posts($args);

        foreach ($featured_posts as $post) {
            delete_post_meta($post->ID, '_featured_post');
        }

        // Set the selected post as featured
        update_post_meta($post_id, '_featured_post', 'on');
    } else {
        // Remove featured status from the selected post
        delete_post_meta($post_id, '_featured_post');
    }

    die();
}
add_action('wp_ajax_update_featured_status', 'update_featured_status');


function enqueue_font_awesome()
{
    wp_enqueue_style('font-awesome', 'https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.0.0/css/all.min.css');
}
add_action('admin_enqueue_scripts', 'enqueue_font_awesome');

    // Code to Show the fetaured post //
    /*
        $args = array(
            'post_type' => 'post',  /*post Type Name*/
            'meta_query' => array(
                array(
                    'key' => '_featured_post',
                    'value' => 'on',
                ),
            ),
        );
        $featured_posts = new WP_Query($args);
        if ($featured_posts->have_posts()) {
            while ($featured_posts->have_posts()) {
                $featured_posts->the_post();
                // Display featured post content here
            }
            wp_reset_postdata();
        } else {
            // No featured posts found
        }
    */

/* code to add featured post option to the default post type */