How to show post count after archive

I am using the following code from https://codex.www.ads-software.com/Template_Tags/get_month_link in order to show abbreviated month on the archive. How do I show the post count after each month with this code?

<?php
$arc_year = get_the_time('Y');
$arc_month = get_the_time('m');
?>
<a href="<?php echo get_month_link("$arc_year", "$arc_month"); ?>">archive
for <?php the_time('M') ?></a>