Use get_top_100.py to retrieve the games in the current top 100 from BGG.
By default, the code creates two file in the files directory:
top_100_latest.jsonbgg_top_100_{current date}.csv
Since the filename for the csv file depends on the date in which the file is created, if scraping regularly a new csv file is created every time the scraper is called. The json file, on the other hand, keeps track of the most recent state of data.
I use this script to daily scrape data from the top 100 of BGG. The results can be accessed here.