add_filter('woocommerce_package_rates', 'hide_shipping_method_based_on_day_of_the_week', 10, 2); 
function hide_shipping_method_based_on_day_of_the_week($rates, $package) { 
  // Set your default time zone
  date_default_timezone_set('Europe/Stockholm');
  // Here set your shipping rate Ids
$shipping_rate_ids = ['flat_rate:10', 'free_shipping:14'];

// Check if today is not Friday (5), Saturday (6), or Sunday (7)
if (!in_array(date('N'), [5, 6, 7])) {
    foreach ($shipping_rate_ids as $shipping_rate_id) {
        if (array_key_exists($shipping_rate_id, $rates)) {
            unset($rates[$shipping_rate_id]); // remove it
        }
    }
}
return $rates;
}