I haven't received an offer either, which is concerning. A few of my friends who also did well got calls from other universities for scholarships immediately on the day of results, so it's a bit worrying. However, they did send me e-mails offering both Biomedical and Engineering scholarships, but I don't really want to do either of those degrees.
If they sent you an email about engineering scholarships, then I'm pretty sure you got the excellence scholarship, I got it too. But I think quantum is asking for the general excellence scholarship-what I got was just for the engineering faculty.
I asked Monash today, they said they are still processing the scholarships, so some people have been offered it and some haven't yet.
https://www.monash.edu/study/fees-scholarships/scholarships/applications/scholarship-offersI think the scholarship availability status is on this website. From the looks of things, they are still sorting it out