Brave shows how many ads and trackers it has blocked, as well as a number that's labeled Time Saved. How that is calculated I haven't the foggiest, but it must be related to download size.
Interesting. I (like others here, apparently) assumed that the time saved number was based on various tracking scripts that weren't downloaded, but if this is the relevant code, looks like it's just tracking parallel requests.
Brave shows this on the "new tab" page. I was surprised with how much these numbers added up over time, though I do suppose they are reasonable estimations.