order notes existance indicator in listing - woocommerce

functions.php

function rwk_order_notes_column( $columns ) {
	$ordered_columns = array();

	foreach ( $columns as $key => $column ) {
		$ordered_columns[ $key ] = $column;
		if ( 'order_date' == $key ) {
			$ordered_columns['order_notes'] = __( 'Order notes', 'woocommerce' );
		}
	}

	return $ordered_columns;
}

add_filter( 'manage_edit-shop_order_columns', 'rwk_order_notes_column', 10, 1 );


function rwk_order_notes_checker( $column, $post_id ) {
	// Get $order object
	$order = wc_get_order( $post_id );

	if ( $column == 'order_notes' ) {
		if ( $order->get_customer_note() ) {
			echo '<strong style="color:green !important; font-size:15px !important;"><span class="dashicons dashicons-yes"></span></strong>';
		} else {
			echo '<strong style="color:red !important; font-size:15px !important;"><span class="dashicons dashicons-no-alt"></span></strong>';
		}
	}
}

add_action( 'manage_shop_order_posts_custom_column', 'custom_shop_order_list_column_content', 10, 2 );