Debouncing a limit switch in Arduino ISR with delays
What you can do (and is anyway far better than waiting in interrupt context), is to have a volatile variable, which you set in the interrupt (say to 1) and in the main loop you check it: once it is set, you execute the delay and then read the value.

Alternatively, if you can change the sensor, just trade the mechanical switch for an optical end run sensor. If your moving object has steady movement, you will not get any bounces from the optical coupler. Then you can just poll it.