Query post from all category with same tag on 1 pages

This will help to get the category post on tag archive page. Let me know.

<?php       

        $current_tag = single_tag_title( $prefix = '', $display = false );
        $categories = get_categories( array('hide_empty' => TRUE) );
        foreach($categories as $category) { ?>
        <?php
            $args=array(
                'posts_per_page' => -1, 
                'tag' => $current_tag,
                'cat' => $category->term_id,
            );

            $the_query = new WP_Query( $args );

            if ( $the_query->have_posts() ) {
                ?>
                <div class="CategoryPost">
                    <h2><?php echo "Tag: " . $current_tag; ?></h2>
              <h2><?php echo "Category: " . $category->name; ?></h2>
              <ul>
              <?php
                echo '<ul>';
                while ( $the_query->have_posts() ) {
                    $the_query->the_post();
                    echo '<li>Post title: ' . get_the_title() . '</li>';
                }
                echo '</ul></ul></div><br>';
            } 
            ?>

        <?php } 
        wp_reset_postdata();