It says it's installing the jailbreak on the phone.
You'll see the little checkra1n symbol,
and it looks like a whole bunch of code running down the phone.
That's totally normal.
It tells you, do not disconnect until it's finished.
But then it's sitting here and it's saying booting,
and then it suddenly switches to all done.
That's it.
This means it worked.
It doesn't look very exciting, but it did work.
So we click Done.