I think that depends on your company procedure and performance, it used to default to 1500 or 1000 feet aal unless modified, but now airbus recommend when single engine, to accelerate at the go around stop altitude (unless there is an intermediate stop when you may use that as the acceleration altitude)
Unlike when on two engines, it does not go from SRS to CLMB at the FMGC performance page set altitude, but will stay in SRS till ALT* or you push VS zero.