wc-shipping-estimate-label.php

<?php // only copy if needed

/**
 * Modifies the delivery estimate label; $label = "day" / "days"
 *
 * @param string $label the label for the day estimate
 * @param int $days number of dates for the estimate
 * @return string - updated label
 */
function sv_wc_shipping_estimate_modify_label( $label, $days ) {
	// Uncomment the version you want to use by removing the slashes before it
  
	// return $label . ' (Excluding Sundays)';
	// return 'business ' . $label;
}
add_filter( 'wc_shipping_estimate_label', 'sv_wc_shipping_estimate_modify_label', 100, 2 );