Hi Rob,
The latest prediction via OccultV4/Astorb/NOMAD has shifted the shadow path off planet and 40 odd minutes later. See...
http://users.tpg.com.au/users/daveg/..._1999RZ253.png
The whole Earth is still within the 1-Sigma and therefore the event is still worth observing.
So the time to watch is 12:17UT = 10:17pm AEST +/- 20 minutes
Regards
DaveGault