Cron saving latests posts to json-file

// Scheduled Action Hook
function latest_vehicles_save( ) {
	$recent_posts = wp_get_recent_posts(array(
	        'numberposts' => 64,
	        'post_status' => 'publish',
	        'post_type'=>'vehicles'
	    ));
	    foreach($recent_posts as $post) :
	            $permalink = get_permalink($post['ID']);
	            $thumbnail = get_the_post_thumbnail($post['ID'], 'full');
	            $title = $post['post_title'];
	    endforeach; 
	    
	    wp_reset_query();
}
add_action( 'latest_vehicles_save', 'latest_vehicles_save' );

// Schedule Cron Job Event
function latests_vehicle_cron_job() {
	if ( ! wp_next_scheduled( 'latest_vehicles_save' ) ) {
		wp_schedule_event( current_time( 'timestamp' ), 'hourly', 'latest_vehicles_save' );
	}
}
add_action( 'wp', 'latests_vehicle_cron_job' );