Hi there,
anything I am saying should be double checked with an RMA and this is only my opinion:
Firstly, a visitor visa is only for a genuine intention to visit Australia. As per my understanding, you might be asked by an immigration officer why you are coming to Australia on a tourist visa whilst having a pending application for a permanent visa.... If your intentions are not genuine, your visitor visa could be cancelled.
Secondly, 190 visa can be granted while you are in Australia. You might also be eligible to a bridging visa if you manage to come to Australia depending on further circumstances.