The ATAR you want will depend on your course.
For example somebody wanting to do say information technology at La Trobe may only need a 55+ where a med student at Monash may need 99.50+ (if I'm not accurate don't kill me), but if both get over their intended "clear in" scores then both will be happy.
You shouldn't really care if someone gets a higher score, I'm only aiming for an 80+ (which seems difficult to me to be honest) but my second preference is a 50+, and a similar course, so I'm not really worried.

Besides, if you have planned correctly throughout the year you should be able to get into your course and if not there are always back doors to your courses.

Saying that, I hope everyone achieves the score they desire tomorrow, and remember the hard work you put in will work off.
Best of Luck!