I dont really believe that bitcoin cash will rally increases rapidly as most is pumping its price now. You can buy bitcoin at anytime because it is still a future of it because this is the original one and bitcoin cash is just a copycat and no right to be on the top. Mostly have decided to invest on bitcoin cash but in limited states. The support is still small and the community is not doing it all.
Whether the bitcoin cash bump or dump you please do not be ready to invest on that. If you look at the bitcoin price today you can understand the bitcoin price will increase or not. I think correction value of bitcoin this time is 6000 US dollars.
Now value started increasing, It is somewhere around 6500 USD in the Coindesk chart.
If you have invest go to mine bitcoins since one the major company move to bch. You will get better scope make your mining path more stronger.