from tqdm import tqdm
from time import sleep

text = """
This is text 123
""" * 100

# repeate text 100 times

with open('out.txt', 'w') as f:
    bar = tqdm(total=len(text), unit='B', unit_scale=True)
    for c in text:
        f.write(c)
        bar.update(1)
        sleep(0.0005)