Iconic WDS - add delivery date/time to Print Invoice & Delivery Notes for WooCommerce by Tyche Softwares

functions.php

<?php
/**
 * Add delivery date and time to Print Invoice & Delivery Notes for WooCommerce by Tyche Softwares.
 *
 * @param array    $fields
 * @param WC_Order $order
 *
 * @return array
 */
function iconic_add_invoice_fields( $fields, $order ) {
	$method        = $order->get_shipping_method();
	$label         = false === strpos( $method, 'pickup' ) ? 'Delivery' : 'Pickup';
	$delivery_date = $order->get_meta( 'jckwds_date' );
	$delivery_time = $order->get_meta( 'jckwds_timeslot' );

	if ( $delivery_date ) {
		$fields['iconic_wds_delivery_date'] = array(
			'label' => $label . ' Date',
			'value' => $delivery_date,
		);
	}

	if ( $delivery_time ) {
		$fields['iconic_wds_delivery_time'] = array(
			'label' => $label . ' Time',
			'value' => $delivery_time,
		);
	}

	return $fields;
}

add_filter( 'wcdn_order_info_fields', 'iconic_add_invoice_fields', 10, 2 );