add_action( 'woocommerce_single_product_summary', 'wc_product_sold_count', 11 );
function wc_product_sold_count() {
   global $product;
   $units_sold = get_post_meta( $product->id, 'total_sales', true );
   echo '<p>' . sprintf( __( '%s продано', 'woocommerce' ), $units_sold ) . '</p>';
}