I went by the book and started watering my conophytums around August 1st but not all of them have woken up yet (or at least not very visibly). Interestingly while the conos I bought this year are quite slow the ones I've had for more than a year were ready for water and immediately started growing.
Here is one of them.
I'm trying to document the waking up process so there will be more pics soon.
5 August
16 August