WooCommerce Checkout Shipping Additional Text

functions.php

add_action( 'woocommerce_after_shipping_rate', 'checkout_shipping_additional_text', 20, 2 );
function checkout_shipping_additional_text( $method, $index ) {
    if ( $method->get_method_id() == 'free_shipping' ) {
        echo '<br>Pesanan akan diterima pada 3 - 5 hari bekerja';
    }
}