Insert multiple posts into one custom category

How to insert a custom post into a custom category?

$post_data = array(
            'post_title' => '...',
            'post_content' => '...',
            'post_type' => 'my-post-type',
            'post_status'   => 'publish',
            'post_author'   => 1,
            'tax_input' => array(
                'my-custon-category' => array( $my_id )
            )
        );
        $post_id = wp_insert_post( $post_data, true);