wrap three posts in div in wordpress

$pcount = 0;

$wrap_div = '<div class="tri-wrap-post">';
/* Start the Loop */
echo $wrap_div;
while ( have_posts() ) : the_post(); $pcount ++;

	get_template_part( 'template-parts/content', get_post_format() );

	if ( $pcount % 3 == 0 ) {
		echo '</div>' . $wrap_div;
	}

endwhile;

echo '</div>';