problems scraping data from a webpage that takes time to load

You could use a library like selenium to achieve this.

For example:

from selenium import webdriver
from bs4 import BeautifulSoup as bs

driver = webdriver.Firefox()
driver.get("https://www.cbn.gov.ng/rates/ExchRateByCurrency.asp")

html = driver.page_source
print(html.find("div",id="ContentTextinner"))

driver.quit()