If you want to display product final price after quantity box then you have to follow below instruction.

You need to overwrite addtocart.phtml file in your theme.

Then put below code after quantity input.

<?php 
echo $this->getLayout()
 ->createBlock('MagentoCatalogPricingRender',
 "product.price.final.clone",
 [
 'data' => [
 'price_render' => 'product.price.render.default',
 'price_type_code' => 'final_price',
 'zone' => 'item_view'
 ]
 ]
 )
 ->toHtml();
?>

Anything more? Nopes, that’s it. Try the given code and you will able to display product price programmatically.