WooCommerce - Hide shipping cost when free delivery is available

functions.php

// Free Delivery
add_filter( 'woocommerce_package_rates', 'my_hide_shipping_when_free_is_available', 100 );
function my_hide_shipping_when_free_is_available( $rates ) {
	$free = array();

	foreach ( $rates as $rate_id => $rate ) {
		if ( 'free_shipping' === $rate->method_id ) {
			$free[ $rate_id ] = $rate;
			break;
		}
	}

	return ! empty( $free ) ? $free : $rates;
}

// Woocommerce Remove Company input
add_filter( 'woocommerce_checkout_fields' , 'my_remove_checkout_fields' ); 

function my_remove_checkout_fields( $fields ) { 
    unset($fields['billing']['billing_company']); 
    return $fields; 
}