Largely answered on your other thread.
You probably won't be given an immediate custodial sentence if the judge sees the offence as 'Category 3'. However there may be factors, which you've not told us, which could take the offence into a higher category. e.g. using a weapon can result in that happening and (for example), as far as the courts are concerned, a shoe on your foot counts as a 'weapon'. So if you kicked the guy while he was on the ground (particularly if you aimed a kick at his head) you could well end up being sentenced for a 'Category 2' offence, which automatically results in a custodial sentence (although even that could then be suspended).