The drive is probably already waterproof.
The display, however, is less so.

So according to the manufacturer it is IPX5
Protected against water jets (nozzle) from any angle (or from all directions). So it shouldn't really matter too much.

I don't know, I do it and it still runs

I haven't tested it yet and have only ridden it in dry weather so far......

Yes, it's no problem at all.