Using NSTimer as "delay" in AppleScriptObjc

Question

I'm trying to use NSTimer as "delay" in AppleScript, in other words, I want to use NSTimer for only waiting.

on buttonClicked_(sender)
    log "Button is clicked"
    NSTimer's scheduledTimerWithTimeInterval_target_selector_userInfo_repeats_(60, me, "timerFired:", "Whatever", false) -- I want to make this line work like "delay 60"!
    log "Finished"
end buttonClicked_

on timerFired_(theTimer)
    log "Timer Fired"
end timerFired_

However, this code outputs following:

: Button is clicked
: Finished
: Timer Fired

This occurred because NSTimer starts but doesn't wait for a next operation.

on buttonClicked_(sender)
    log "Button is clicked"
    delay 60
    log "Finished"
end buttonClicked_

on timerFired_(theTimer)
    log "Timer Fired"
end timerFired_

After all, I want to substitute "delay" for "NSTimer" without changing the format.