Show/Hide post based on time

Hi,

I have a category called “Shows” where I post programs which broadcast on different days/time. What I want is to DISPLAY the program from “Shows” category based on time/date.

For example:
I have created a post which broadcast on Every Monday at 6:00 PM, what I want is to show the post on Monday 6:00 PM for about an hour and hides automatically and show again on next week Monday 6:00 PM only. I have installed ACF date&time picker plugin also. Here is my query:

<?php
global $post;
$args = array('category' => 8, 'numberposts' => 4,'orderby' => 'date','order' => 'ASC',);
$myposts = get_posts( $args );
foreach( $myposts as $post ) : setup_postdata($post); ?>
<?php
$postDate = strtotime( $post->post_date );
$todaysDate = time() - (time() % 86400);
$todayTime = get_field('now_show_time');
$time= time();
if ( $postDate >= $todayTime) : ?>
<li><a href="<?php the_permalink(); ?>" style="font-size:11px;"><span style="font-weight:bold;color:#afaca5"><?php the_time('n/j'); ?>:</span> <?php the_title_attribute(); ?></a></li>
<?php endif; ?>
<?php endforeach; ?>

Please help me to find a solution and tell me what am I doing wrong there?