Can't find iPod touch fifth gen. Will find iPhone app work?

I did not install find iPhone app before losing it. However, I installed it on my iPhone 3rd generation after losing the iPod. It shows in devices but as offline. So will the sound play even if its offline or it won't work because the app is not installed on the lost device? It says pending on play sound and lost mode.

You are not able to view your iPod touch (or UAV) if it is not online.