Timeout / early kill an external process

I want to do a terminal command (on linux) with a timeout. I know there is not a timeout built into the run command so I was trying to do something to make one. So basically I tried:

function run_with_timeout(command::String, timeout::Integer = 5)
    cmd = run(`$command`; wait = false) 
     for i in 1:timeout 
         if success(cmd) return :success end 
         sleep(1)
     end
     kill(cmd) 
     return :failed
end
command = "sleep 3"
run_with_timeout(command)

This doesn’t work because success(cmd) waits until the process finishes rather than immediately saying whether or not the process has finished yet.

Is there a function that immediately says whether or not a process is finished yet? Any other way to achieve this goal?

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