How many coins are active in Bcash chain How many coins have moved in Bcash chain since the fork? 
Does any web publish a graph tracking this value?

It would be interesting to see how does it compare with an updated version of the chart below (source) to check how many old coins were moved to claim BCH apart from the ones split by the exchanges.
4,636,031 BTC moved on the Bcash side of the fork as of Sept 28th.

4,852,648 BTC moved on the Bitcoin side of the fork as of Sept 28th.

Source: some scripts I run regularly. I intend to create a website with it at some point.