No, it isn't, You should have moved them before July 31st. Well... where to begin now? At this point, we have nearly all miners ready to signalise readiness for BIP91, one step on the way to segwit2x and lightning network. The problem is that we can see some unknown variables. Of course miners might signalise BIP91, but this does not necessarily mean they will run the code later on. Time will tell!

Moving Your BTC to a cold wallet now would just keep You a littlebit safer, since we are shipping unknown waters.