WooCommerce set % discount when 2 or more products are in shopping cart

functions.php

function custom_cart_discount() {
    $discount_percentage = 10; // Replace with your desired discount percentage
    $cart = WC()->cart;

    if ( $cart->get_cart_contents_count() >= 2 ) {
        $discount = $cart->subtotal * ($discount_percentage / 100);
        $cart->add_fee( 'Bulk Discount', -$discount );
    }
}
add_action( 'woocommerce_cart_calculate_fees', 'custom_cart_discount' );