Get All Post Type

$get_cpt_args = array(
    'public'   => true
);
$post_typek = get_post_types( $get_cpt_args);

$args = array(
    'post_type' => $post_typek,
    'posts_per_page' => -1,
    // Several more arguments could go here. Last one without a comma.
);
// Query the posts:
$obituary_query = new WP_Query($args);