Orderable - Change "Today" and "Tomorrow" label in the checkout

gistfile1.txt

/**
 * Orderable.
 * Modify 'Today' label.
 *
 */
function change_delivery_today_text( $translated_text, $text, $domain ) {
        switch ( $translated_text ) {
                case 'Today' :
                        $translated_text = __( 'Add Text Here', 'woocommerce' );
                        break;
        }
        return $translated_text;
}
add_filter( 'gettext', 'change_delivery_today_text', 20, 3 );


/**
 * Orderable.
 * Modify 'Tomorrow' label.
 *
 */
function change_delivery_tomorrow_text( $translated_text, $text, $domain ) {
        switch ( $translated_text ) {
                case 'Tomorrow' :
                        $translated_text = __( 'Add Text Here', 'woocommerce' );
                        break;
        }
        return $translated_text;
}
add_filter( 'gettext', 'change_delivery_tomorrow_text', 20, 3 );