For reference, in Non-Diabetics:-
2 hours after eating doesn't exceed 120 (But optimal would be lower, and would probably be < 100, or fairly close to the fasting level).
Fasting would be < 95 (but optimal is probably between 70 and 80)..
But yes, ask your doctor your personal targets. They vary.
Just like A1C. For example:-
Optimal is about 4.7 (in non diabetics).
The cut off for diabeties is usually about 6.0.
Obviously there is a very big difference between 4.7 and 6.0.
Correction to "Call or visit or your doctor and ask for his/her reference range." That should read "Call or visit or email your doctor and ask for his/her reference range.
"If you are the former, then it would be abnormal to rise above 120 for a non-diabetic."
The aim is to keep postprandial blood sugar levels below 140 mg/dL; anything over 180 mg/dL. is unacceptable. These are basic USA standards and may or may not be practiced by your doctor in Australia. Call or visit or your doctor and ask for his/her reference range.
I can't tell from your post if you are someone trying to see if they have diabetes, or a diagnosed diabetic wondering where they should be at post prandial. If you are the former, then it would be abnormal to rise above 120 for a non-diabetic. Also for a diagnosed diabetic, many doctors still use the ADA figure of 180 but studies have shown that complications begin at sustained numbers above 140 so that might be a safer goal imho.
One hour varies widely per individual and usually doesn't get referenced unless extremely high. Two to three hours after a meal is either <140 mg/dl or <180 mg/dl [< means less than] depending on what your doctor wants.