WordPress Loop in Made theme Google structured Data

content.php

<?php
/**
 * Post rendering content according to caller of get_template_part.
 *
 * @package understrap
 */
if ( ! defined( 'ABSPATH' ) ) {
	exit; // Exit if accessed directly.
}
?>

<article <?php post_class(); ?> id="post-<?php the_ID(); ?>" role="article" itemprop="hasPart" itemscope="" itemtype="http://schema.org/Article">
<meta itemscope='itemscope' itemprop='mainEntityOfPage' itemType='https://schema.org/WebPage'/>

	<header class="entry-header">

		<?php
		the_title(
			sprintf( '<h2 class="entry-title" itemprop="headline"><a href="%s" rel="bookmark" itemprop="url">', esc_url( get_permalink() ) ),
			'</a></h2>'
		);
		?>

		<?php if ( 'post' == get_post_type() ) : ?>

			<div class="entry-meta">
				<?php understrap_posted_on(); ?>
        
        <!-- 2. Post Meta Start -->
    <p>
        <!-- 2.1 Published date Start -->
        Published on <span datetime="<?php echo the_time('c'); ?>" itemprop="datePublished" content="<?php echo the_time('c'); ?>">
            <?php the_time('M j, Y'); ?>
        </span>
        <!-- 2.1 Published date End -->
        
        <!-- 2.2 Author Start -->
        by <span class="post-author vcard" itemprop="author" itemscope itemtype="https://schema.org/Person">
        <span itemprop="name"><?php the_author(); ?></span>
        </span>
        <!-- 2.2 Author End -->
        
        <!-- 2.3 Category Start -->
        in <?php the_category(', '); ?>
        <!-- 2.3 Category End -->
    </p>
    <!-- 2. Post Meta End -->
        
			</div><!-- .entry-meta -->

		<?php endif; ?>

	</header><!-- .entry-header -->

	<?php echo get_the_post_thumbnail( $post->ID, 'large' ); ?>
  
  <!-- 3. Thumbnail Start -->
    <?php if ( has_post_thumbnail() ) { ?>
    <span itemprop="image" itemscope itemtype="https://schema.org/ImageObject">
        <a href="<?php the_permalink(); ?>" rel="bookmark">
            <?php the_post_thumbnail('medium'); ?>
        </a>

        <?php
        $thumb_id = get_post_thumbnail_id();
        $thumb_url_array = wp_get_attachment_image_src($thumb_id, 'medium', true);
        $thumb_url = $thumb_url_array[0];
        ?>
        <meta itemprop="url" content="<?php echo $thumb_url ?>">
        <meta itemprop='width' content='569'/>
        <meta itemprop='height' content='309'/>  
    </span>
    <?php } ?>
    <!-- 3. Thumbnail End -->

	<div class="entry-content">

		<span itemprop="description">
        <?php the_excerpt(); ?>
    </span>

		<?php
		wp_link_pages(
			array(
				'before' => '<div class="page-links">' . __( 'Pages:', 'understrap' ),
				'after'  => '</div>',
			)
		);
		?>

	</div><!-- .entry-content -->

	<footer class="entry-footer">

		<?php understrap_entry_footer(); ?>

	</footer><!-- .entry-footer -->
  
  <div class="publisher-img" itemprop="publisher" itemscope itemtype="https://schema.org/Organization">
    <div itemprop="logo" itemscope itemtype="https://schema.org/ImageObject">
      <img src="site-logo.png" width="396" height="91"/>
      <meta itemprop="url" content="site-logo.png">
      <meta itemprop="width" content="232">
      <meta itemprop="height" content="90">
    </div>
    <meta itemprop="name" content="TreeHost Web Solution">
    </div>
    <meta itemprop="dateModified" content="<?php echo the_time('c'); ?>"/>

</article><!-- #post-## -->