使用元数据从前端表单插入自定义帖子类型

I can successfully create a WordPress custom post using a form. The issue I have is I can't get the post meta into the custom post type.

In my form processor file:

$custom1 = isset($_POST['custom1']) ? $_POST['custom1'] : '';
$custom2 = isset($_POST['custom2']) ? $_POST['custom2'] : '';
require_once('../../../wp-load.php');

//Insert form data into post array
        $post_information = array(
            'post_title' => wp_strip_all_tags($title),
            'post_content' => $description,
            'post_type' => 'review-listing',
            'post_status' => 'draft'
        );
        wp_insert_post($post_information);
        if ($post_id) {
           // insert post meta
           add_post_meta($post_id, 'custom1', $custom1);
           add_post_meta($post_id, 'custom2', $custom12);
        }

Thanks,