228w on the +12v rail.
I3-2120(65w) + GT 1030(30w) + another 10-20 headroom for everything else = 115w.
@sizzling is ok to correct me on this, but I'd say you're in an ok spot. Psu's from prebuilts aren't great, but you can still use that with the current setup you have.
Although, the moment you want to get something like a GTX 1050, or a 1650, the psu will have to go first.