In 2018, total votes cast in Arizona was 2,384,308.
That’s a good approximation for how many ballots was cast this year.
So far there is 1.93 million votes counted.
So there should be about anywhere from 400,000 to 500,000 left to count.
The population of Arizona has also increased by about 3.5% since 2018.
Factoring that in would produce a vote total of +/- 2,465,000 with 535,000 or so remaining.