I want to print the meta_value of all with the key "post_views_count" from the post_meta table

<?php
    $args = array(
        'orderby' => 'name',
        'parent' => 0,
        'depth' => 0
    );

    $categories = get_categories( $args );

    foreach ( $categories as $category ) {
        $cat_id = $category->term_id;
        $args_post = array(
            'cat' => $cat_id,
            'post_type' => 'post',
            'posts_per_page' => '-1', 
        );
        $query = new WP_Query( $args_post );

        $allview = array();

        if ( $query->have_posts() ) {
            while ( $query->have_posts() ) {
                $query->the_post();
                $post_id = get_the_ID();
                if ( !isset( $allview[$cat_id] ) {
                   $allview[$cat_id] = 0;
                }
                $post_views_count = get_post_meta( $post_id, 'post_views_count' );

                $allview[$cat_id] = (int)$allview[$cat_id] + (int)$post_views_count;
            }
        }
    }

    //display results
    foreach ( $allview as $cat => $value ) {
        echo $cat . ' = ' . $value;
    }
 ?>