What number is too low after a meal

One to two hours after a meal is too low? I’m at 91 after a meal and usually have been around that eating my final meal, which is cereal with high fiber. Is this too low? I know it says for a diabetic 180 or below after a meal is ideal and even for a non diabetic is 140 or below. Just wanting to see if it should be a little higher after a meal or is this good? Thanks