delivery-times-checkout-default-delivery-text.php

<?php
/**
 * Delivery Times for WooCommerce checkout select default text
 *
 * Change the default text that gets displayed in the delivery times checkout select field
 * 
 * @param string $text - the default text
 * 
 * @return string
 */
function acme_checkout_delivery_times_select_default_text( $text ) {
  $text = '';
  return $text;
}
add_filter( 'dtwc_checkout_delivery_times_select_default_text', 'acme_checkout_delivery_times_select_default_text' );