I've heard that it's roughly 1%. It probably isn't too high because: 1) The main chain's rate of block generation has not dropped substantially. Of course, it'

I've heard that it's roughly 1%. It probably isn't too high because: 1) The main chain's rate of block generation has not dropped substantially. Of course, it's hard to tell in such a short timeframe, but at least according to https://bitcoinwisdom.com/bitcoin/difficulty https://bitcoinwisdom.com/bitcoin/difficulty not much is happening. 2) No BCH blocks have been mined in the past 2.5 hours. This could be variance (even with 100% of the hashrate this sort of gap is plausible), but I suspect not.