Given this information, I believe that your friend's current performance is consistent with an ATAR between 94 and 96.5.
Your friend's performance is essentially favourable across all of their subjects. In particular, Mathematics Extension 1 appears to be their best-performing subject, and is therefore likely to make a very positive contribution to their ATAR. Because of this, it is important that your friend prepares for their remaining exams to the best of their ability.
The same can also be suggested regarding Mathematics Extension 2, Information Processes and Technology as well as Software Design and Development (i.e. your friend's performance is also of a high standard in these subjects). Your friend must therefore also do their utmost in preparation for these subjects so as to ensure that they end up making a positive contribution to their ATAR.
It seems that English Standard is their lowest-performing subject. While this does not necessarily suggest that their performance is of a low standard, they definitely have the opportunity to focus more on this subject, which will hopefully allow them to improve their overall position. This can in turn result in English Standard making a better contribution to their ATAR, which also means that it can potentially exceed this estimate.
I hope this helps!