Teslafi (and other similar services) use an api provided by tesla to ask your car for its status (location, speed, power input/output, orientation etc) about once every minute and then stores the result for you (the storage and analysis is the added benefit above what you could do yourself)
2020.48.12.1 is the most prevalent version currently, you're not behind. You'll get 2020.48.26 within a week I'd guess