WooCommerce remaining cost for free shipping notification

functions.php

function cart_notice() {
  $free_shipping_settings = get_option( 'woocommerce_free_shipping_settings' );
  $maximum = $free_shipping_settings['min_amount'];
  $current = WC()->cart->subtotal;
  if ( $current < $maximum ) {
    echo '<div class="woocommerce-message">Get free shipping if you order $ ' . ($maximum - $current) . ' more!</div>';
  }
}
 
add_action( 'woocommerce_before_cart', 'cart_notice' );