WP Specific Post Format display

//Specific Post format post display
<?php
// the query
$slider_post = new WP_Query(array(
    'post_type' => 'post',
    'posts_per_page' => 3,
    'tax_query' => array(
        array(
            'taxonomy' => 'post_format',
            'field' => 'slug',
            'terms' => array( 'post-format-gallery' ),
            'operator' => 'IN'
        )
    )
));

?>

<?php if ($slider_post->have_posts()):

    while ($slider_post->have_posts()) : $slider_post->the_post();

       if( get_post_format() == 'gallery' ) : ?>

		//My html dynamic code here

       <?php endif;

       endwhile;
       else :
       echo wpautop('Sorry, no posts were found');
endif;  ?>