Product discount

<?php 

global $product;

     $discount = '';
     $regurlar_price = get_post_meta( get_the_ID(), '_regular_price', true);
     $sale_price  = get_post_meta( get_the_ID(), '_sale_price', true);
     
     if($regurlar_price && $sale_price ){
         $price = $sale_price * 100 / $regurlar_price;
         $discount = round(100 - $price);
    }

    if($discount){
        echo '<span class="brand-color2">-'.$discount.'%</span>';
    }
   ?>