Simple plugin in to display a custom field from a woocommerce product named delivery_time_frame on product pages

woocommerce_delivery_time_frame.php

<?php
/*
Plugin Name: WooCommerce Delivery Time Frame.
Plugin URI:  http://stevenhoney.com
Description: Proof of concept not tested beyond a single localhost install, copy at your own risk.
Version:     1.0
Author:      Steve Honey
Author URI:  http://stevenhoney.com
*/

add_action( 'woocommerce_after_single_variation', 'woocommerce_after_single_variation_display_delivery_time_frame' );

function woocommerce_after_single_variation_display_delivery_time_frame(){
  $time_frame = get_post_meta( get_the_ID(), 'delivery_time_frame', true );
  if( $time_frame ){
    echo '<p>Target Delivery: ' . $time_frame . '</p>';
  }
}