Display Featured Images from a Custome Post Type

<?php
/*
Template Name: Display Featured Images from a Custome Post Type
*/
?>


<?php
$loop = new WP_Query( array( 'post_type' => 'homepageslides', 'posts_per_page' => 3));
while ( $loop->have_posts() ) : $loop->the_post();
?>
<div><?php echo the_post_thumbnail(full); ?></div>
<?php endwhile; ?>