CPT metabox check option to show CPT post on page template

content-reports.php

<article <?php post_class(); ?>>

   <a href="<?php the_permalink(); ?>">

    <header class="heading-cpt">
      <?php
      if ( has_post_thumbnail() ) { // check if the post has a Post Thumbnail assigned to it.
      the_post_thumbnail( 'full' );
      }
      ?>

      <div class="hover-btn-cpt hidden">

        <a class="btn-cpt" href="<?php the_permalink(); ?>"><?php _e( 'READ', 'genium' ); ?></a>

        <i class="fa fa-angle-right"></i>

      </div>

    </header>

    <div class="entry-summary">

      <h4 class="entry-title"><?php the_title(); ?></h4>

    </div>

    <div class="entry-author">

      <p><?php echo __( 'Author:', 'genium' ); ?> <a href="<?php echo get_author_posts_url( get_the_author_meta( 'ID' ) ); ?>" rel="author" class="fn"><?php echo get_the_author(); ?></a></p>

    </div>

  </a>

</article>

functions.php

/**
 * Show post on home page check metabox on cpt events
 */
add_action('post_submitbox_misc_actions', 'metabox_reports');
add_action('save_post', 'metabox_reports_save');

function metabox_reports()
{
    $post_id = get_the_ID();

		if (get_post_type($post_id) != 'reports') {
				return;
		}

    $value = get_post_meta($post_id, '_reports_custom_field', true);
    wp_nonce_field('my_custom_nonce_'.$post_id, 'my_custom_nonce');
    ?>
    <div class="misc-pub-section misc-pub-section-last">
        <label><input type="checkbox" value="1" <?php checked($value, true, true); ?> name="_reports_custom_field" /><?php _e('Show on home page', 'pmg'); ?></label>
    </div>
    <?php
}

function metabox_reports_save($post_id)
{
    if (defined('DOING_AUTOSAVE') && DOING_AUTOSAVE) {
        return;
    }

    if (
        !isset($_POST['my_custom_nonce']) ||
        !wp_verify_nonce($_POST['my_custom_nonce'], 'my_custom_nonce_'.$post_id)
    ) {
        return;
    }

    if (!current_user_can('edit_post', $post_id)) {
        return;
    }
    if (isset($_POST['_reports_custom_field'])) {
        update_post_meta($post_id, '_reports_custom_field', $_POST['_reports_custom_field']);
    } else {
        delete_post_meta($post_id, '_reports_custom_field');
    }
}

template-page.php

<?php
/*
Template Name: Template page
*/
?>


<?php
$args = array(
  'post_type'   => 'reports',
  'post_status' => 'publish',
  'posts_per_page' => -1,

  'meta_query' => array(
			array(
				'key' => '_reports_custom_field',
				'value' => '1'
			)
		)

 );

$testimonials = new WP_Query( $args );
if( $testimonials->have_posts() ) :
?>

    <?php
      $i = 1;

      while( $testimonials->have_posts() ) :

        $testimonials->the_post();

        ?>

          <div class="col-md-4 col-sm-12 no-padding no-gutter hover-<?php echo $i; ?>">


            <?php get_template_part( 'partials/content', 'reports' ); ?>

          </div>

        <?php $i++;

        endwhile;

        wp_reset_postdata();
    ?>

<?php
else :
  esc_html_e( 'No testimonials in the diving taxonomy!', 'genium' );
endif;
?>