What is most important is the total onchain transaction in relation to segwit, I use
https://mempool.observer for tracking this, I use it to track transactions that replace-by-fee is enabled as well. Total segwit transactions give more accurate information about the total number of people using it for cheaper transaction. The exchanges that are supporting segwit can be of help, but many of them are still charging the usual fee they were chargimg before, like Binance has been charging 0.0005 BTC for long, despite the fact that some of their transactions are sefwt transactions.
It shows how SegWit is being adopted among popular exchanges. 18 exchanges were taken as the basis, which are the largest consumers of the blockchain space, and this is currently ~ 40%:
I wish to know the exchanges among them that reduced the fee they are charging their customers after they are supporting segwit, most likely less than 20% of the exchanges will do that.
This link is not working, maybe from the source, I mean glassnode.