Add your cpts to the Widget Activity of the Dashboard in WordPress

dashboard-activity-cpt.php

<?php

/*
  Plugin Name: Dashboard Widget Activity Custom Post Type
  Plugin URI:
  Description:
  Author: Daniele Mte90 Scasciafratte
  Version: 1.0.0
  Author URI: http://mte90.net
 */


//Add the support for your cpt in the Widget Activity of the Admin Dashboard
if ( is_admin() ) {
	add_filter( 'dashboard_recent_posts_query_args', 'add_page_to_dashboard_activity' );

	function add_page_to_dashboard_activity( $query_args ) {
		if ( is_array( $query_args[ 'post_type' ] ) ) {
			//Set yout post type
			$query_args[ 'post_type' ][] = 'page';
		} else {
			$temp = array( $query_args[ 'post_type' ], 'page' );
			$query_args[ 'post_type' ] = $temp;
		}
		return $query_args;
	}

}