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add_action('salesking_my_orders_custom_columns', function(){
	?>
	<th class="nk-tb-col tb-col-sm"><span class="sub-text"><?php esc_html_e('Order Notes','salesking'); ?></span></th>
	<?php
});
add_action('salesking_my_orders_custom_columns_footer', function(){
	?>
	<th class="nk-tb-col tb-col-md"><?php esc_html_e('order notes','salesking'); ?></th>
	<?php
});
add_action('salesking_my_orders_custom_columns_content', function($order){
	?><td class="nk-tb-col tb-col-md"> <?php

	$order_id = $order->get_id();
	$order_notes = get_private_order_notes( $order_id );
	foreach($order_notes as $note){
	    $note_content = $note['note_content'];

	    // Outputting each note content for the order
	    echo '<p style="font-size:10px">'.$note_content.'</p>';
	}
	?></td><?php
}, 10, 1);
function get_private_order_notes( $order_id){
    global $wpdb;

    $table_perfixed = $wpdb->prefix . 'comments';
    $results = $wpdb->get_results("
        SELECT *
        FROM $table_perfixed
        WHERE  `comment_post_ID` = $order_id
        AND  `comment_type` LIKE  'order_note'
    ");

    foreach($results as $note){
        $order_note[]  = array(
            'note_id'      => $note->comment_ID,
            'note_date'    => $note->comment_date,
            'note_author'  => $note->comment_author,
            'note_content' => $note->comment_content,
        );
    }
    return $order_note;
}