Location is everything. You should only take advice from your next door neighbors. The key factors are flows and dearths, how long they last.
I agree with Brian. Local help would be best as location matters. I will ask, are Small Hive Beetles a problem at your location or area?
I also agree. It's difficult for us North Americans to give you good advice in this area. Your plants, pests, flowers, flows, and temperatures are unknown to us, and answering this question requires that knowledge. Taking off honey depends on a lot of factors. At what point will your season change? How much honey will the bees need to get through winter? Can you expect another flow this year? How early next year will the first flow be? Is the honey on your hive a variety worth collecting? How strong is the hive, and what hive strength is normal for this time of year? Without experience in the answers to these questions, it's almost impossible for us to give you any advice worth taking. Hopefully some of our Australian members are close enough to where you live to help you out better.
Without knowing the answers to those questions, if it is your first season, I'd be very hesitant to take any honey. If I understand you, your hive has a brood box and one super, and you are questioning if you can harvest the super for yourself. In my area that would be a solid no, unless you are prepared to feed them to replace it, like Ben Framed mentioned. The honey around the periphery of the brood nest is no where near enough for a hive to survive the winter. But as I said, for your situation that advice could be wrong for all I know about your area.