Not sure about the question, are you asking about trying to automatically go to hold or have it do it for you at a set time?
For new users, The finishing temp is a target not a specific one. And never do it for ribs. Unless you've done it a bunch of times and have the times/temps down you like, then okay. But ribs have more variance than any other product to finish, that's why I will never give you a temp for ribs, because as Tom said above, there's a lot of variation to consider.
I know of ONE team that tries to cook ribs by a temp, but even they will tell you it's not exact.