Well, I am guessing you will have met the 1 hr. fast but, I am also guessing you will get this post way too late to do you any good.
To be sure to make the 1 hr. fast I suggest you eat a minimum of 45 minutes before the start of Mass that way you get into the habit of being prepared.
You could also just look at your watch right before Communion to see if you have met the 1 hr. fast (give or take about 5 minutes). I know I have done that when I go to weekday Mass.
Brenda V.