Partial using Tkinter function

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Hi guys! I have this program which displays the time. The time is updated via a multiprocessing Process() which is targeted at a partial. However, the partial's function is supposed to set the value of a tkinter StringVar(). But, I get this error:

Error:
Exception in Tkinter callback
Traceback (most recent call last):
  File "C:\Users\joshu\AppData\Local\Programs\Python\Python38-32\lib\tkinter\__init__.py", line 1883, in __call__
    return self.func(*args)
  File "C:/Users/joshu/Downloads/OrderLog.py", line 198, in sign_in_func
    main_app()
  File "C:/Users/joshu/Downloads/OrderLog.py", line 1074, in main_app
    time_process.start()
  File "C:\Users\joshu\AppData\Local\Programs\Python\Python38-32\lib\multiprocessing\process.py", line 121, in start
    self._popen = self._Popen(self)
  File "C:\Users\joshu\AppData\Local\Programs\Python\Python38-32\lib\multiprocessing\context.py", line 224, in _Popen
    return _default_context.get_context().Process._Popen(process_obj)
  File "C:\Users\joshu\AppData\Local\Programs\Python\Python38-32\lib\multiprocessing\context.py", line 326, in _Popen
    return Popen(process_obj)
  File "C:\Users\joshu\AppData\Local\Programs\Python\Python38-32\lib\multiprocessing\popen_spawn_win32.py", line 93, in __init__
    reduction.dump(process_obj, to_child)
  File "C:\Users\joshu\AppData\Local\Programs\Python\Python38-32\lib\multiprocessing\reduction.py", line 60, in dump
    ForkingPickler(file, protocol).dump(obj)
TypeError: cannot pickle '_tkinter.tkapp' object

I'm using PyCharm as my editor.

The code:

now = datetime.datetime.now()

    time_var = StringVar()

    time_set_partial = partial(time_var.set, str(now.hour) + ":" + str("%02d" % now.minute).format(1))
    time_process = Process(target = time_set_partial)
    time_process.start()

    time_of_day = Label(textvariable = time_var)
    time_of_day.pack() 

I think the issue lies somewhere within the time_set_partial = partial(time_var.set, str(now.hour) + ":" + str("%02d" % now.minute).format(1)) line but I'm not sure.

I would be grateful if anyone can help : .