Steam quality (below the superheat range) is defined in terms of dryness fraction x for a given pressure, dry saturated steam has dryness fraction 1, very wet steam, just about to condense back to liquid, has dryness fraction O.
The characteristic of dry saturated steam (x = 0.97) is that it is virtually invisible close to the nozzle; the jet only becomes clearly visible some 10-11 diameters downstream.
Cold start to superheat steam production is typically 4-5 minutes; dry saturated steam 2-3 minutes, wet steam 1-2 minutes.