How to add a Woocommerce buy now button for variable products without plugin?

Question

I wish to ADD a "buy now" button on product page for variable products. I tried many snippets code but those are working only for simple products.

function add_content_after_addtocart() {

$current_product_id = get_the_ID();

$product = wc_get_product( $current_product_id );

$checkout_url = wc_get_checkout_url();

if( $product->is_type( 'simple' ) ){ echo 'Buy Now'; } } add_action( 'woocommerce_after_add_to_cart_button', 'add_content_after_addtocart' );

above code is only working for simple products. In the same way I would like to create buy now button on variation product page. Please do help

Thank you.