See Post Related Meta in a side metabox

Troubleshoot Post Meta Value

<?php
/**
 * Show Post Meta in a metabox
 */

add_action( 'add_meta_boxes', 'wpdocs_register_meta_boxes' );

function wpdocs_register_meta_boxes() {
    add_meta_box( 
        'meta-box-id', 
        'Information Box', 
        'display_post_meta_data_callback', 
        'sb-people-listing', // Change the post-type here.
        'side', 
        'high'
    );
}

function display_post_meta_data_callback(){
    
	// global $post;
    // $post_id = $post->ID;

	echo '<pre>';
	var_dump( get_post_meta(get_the_ID()) );
	echo '</pre>';

}