How to wait for completion of a remote process using WMI?

def run_remote(self,cmd, async=False, minimized=True, output=False):
        """
        this function runs cmd on remote machine, using wmi. the function create a .bat file,
        copies it to the remote machine, and runs the .bat file
        inputs: cmd - command to run
                mimimized - window state
                output - True, returns the command's output
        output: return value of the command
        """
        output_data =None
        pwd=os.getcwd()
        bat_local_path =os.path.join(pwd,'output.bat')
        bat_remote_path =os.path.join(self.remote_path,'output.bat')
        output_remote_path =os.path.join(self.remote_path,'output.txt')
        output_local_path =os.path.join(pwd,'output.txt')
        text =cmd + " > " + output_remote_path
        create_file(bat_local_path, text)
        self.net_copy(bat_local_path,self.remote_path)
        batcmd = bat_remote_path

        SW_SHOWMINIMIZED =0
        ifnot minimized:
            SW_SHOWMINIMIZED =1
        print"Executing '%s' command" %cmd
        startup =self.connection.Win32_ProcessStartup.new(ShowWindow=SW_SHOWMINIMIZED)
        process_id, return_value =self.connection.Win32_Process.Create(CommandLine=batcmd,ProcessStartupInformation=startup)

        """This is where I face the issue"""
        if output andnot async:
            print'copying back ' + output_remote_path
            """This net_copy_back fucntion does not wait for batch file execution to complete.  So it cannot find the output.txt file which is generated after some duration (if I set a debug point here, it then gives enough time for execution of batch file to complete, so the file is then copied successfully)"""
            self.net_copy_back(output_remote_path, output_local_path)
            output_data =open(output_local_path,'r')
            output_data ="".join(output_data.readlines())
            self.net_delete(output_remote_path)
        self.net_delete(bat_remote_path)
        return return_value