They're listed as flash triggers, but if you read the description you'll see that they can also work as shutter triggers.. ahh, but you need a timer as well? Not sure in that case. For a timer remote I use a wired model made by Phottix. Neither the RF-602 nor the RF-603 will act as a remote timer.
I have seen wireless remote timers for sale, but as I use a timer remote for long exposures I prefer the wired to the wireless as I have (probably unfounded) concerns about interference.