Playing around with tkinter and bubble popups

[menator01]

Can't seem to get more than one at a time to popup but, all do popup after the one before fades.
Any thoughts welcome.

import tkinter as tk
from random import randrange, uniform, choice
from time import time

class Bubble(tk.Tk):
    ''' Class creates popup window '''
    def __init__(self, *args, text='Default Text', **kwargs):
        super().__init__(*args, **kwargs)

        # Instance variables removes titlebar and grabs focus of window
        self.wait_visibility(self)
        self.wm_attributes('-topmost', True)
        self.wm_attributes('-alpha', 0.9)
        self.wm_attributes('-type', 'splash')
        self.focus_force()

        # Get time window opens, set duration for window, and set opacity of window
        self.start = time()
        self.duration = 5
        self.opacity = float(0.9)

        self.label = tk.Label(self, text=text, padx=10, pady=10, bg='#fffdd0')
        self.label.pack(fill='x', expand=True)
        self.label.configure(
            wraplength = 300,
            justify = 'left',
            font = (None, 14, 'normal')
        )

        # get window info for positioning of window
        self.update()

        # Calculations for window geometry
        x = self.winfo_screenwidth()//2, self.winfo_screenwidth()-int(self.winfo_screenwidth())
        self.xpos = randrange(x[0], self.winfo_screenwidth()-int(self.label.winfo_width()*0.9))
       
        self.ypos = int(self.winfo_screenheight()*uniform(0.2, 0.4))
       
        # Set window geometry
        self.geometry(f'{self.label.winfo_width()}x{self.label.winfo_height()}+{self.xpos}+{self.ypos}')

        # Start timer and mainloop
        self.timer()
        self.mainloop()
       


    def timer(self):
        ''' Method for countdown timer '''
        counter = self.duration + self.start - time()
        seconds = int(divmod(counter, 60)[1])

        # Call timer every one second
        self._timer = self.after(1000, self.timer)

        if seconds == 1:
            self.fade()

    def move(self):
        ''' Method for moving bubble up '''
        self.ypos -= 20

    def fade(self):
        ''' Method for creating fade and move up effect '''
        self.opacity -= float(0.1)
        self.wm_attributes('-alpha', self.opacity)
        disolve = self.after(100, self.fade)
        up = self.after(0, self.move)
        self.geometry(f'{self.label.winfo_width()}x{self.label.winfo_height()}+{self.xpos}+{self.ypos}')

        if self.opacity <= float(0.0):
            self.after_cancel(self._timer)
            self.after_cancel(disolve)
            self.after_cancel(up)
            self.destroy()

messages = [
    'Hello World! This is a random messages.',
    'The skys are blue and the clouds are white and fluffy.',
    'I look at you and my blood boils hot, I feel my temperature rise.',
    'Who\'s that knocking at the door? Is it you again? You can love me tonight, \
if you want. In the moring make sure your gone.'
]

t = Bubble(text=choice(messages))

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