There's lots of places you can tap into an ignition switched wire. Let me know where it would be most convenient (specific location in the interior or engine compartment) and I'll let you know what your closest option is. My FSM is for the '99, but so far the wire colors seem to be the same.
Also, I don't know if you drew up that diagram or if you got it from somewhere, but I think you may want to revise it. I seem to recall your other thread mentioning the timer was not rated for much amperage. The way you have it wired, the timer will be handling the full current draw of the fan. You should use the timer to control a relay that supplies power to the fan. If you can tell me whether or not that timer can be activated by removing a 12V+ from the trigger input, I can draw you up a quick diagram for how I'd suggest wiring it.