It'd be crazy if we detected radio signals, in part because we don't really have a good way to send any probes fast enough to visit it closer as it speeds away from us, at least with current technologies. There's more on that here: https://arstechnica.com/science/2017/11/so-you-want-to-send-...
It may sound silly, but I find it fascinating that we're finally in a time when someone in such high position in science can say such a thing without fearing ridicule. I'm also grateful that there are people wealthy enough to sponsor these scientific efforts. What an amazing time!
I guess barring that we will soon have the JWST.
Imagine the alien probe about to leave the outer perimeter of our solar system while our makeshift-to-the-aliens probe is trying to catch up to it while detonating one nuke after another.
You'd think that would catch their attention.