Hi,
To directly answer the question: about 55% over a long period and thousands of trades. However, it isn't an especially important performance metric and you can't view it in isolation. It has to be related to size of average win vs. average loss as a minimum.
A long term trend follower might have a very low win % but win size many multiples of loss size. A scalper, conversely, is likely to have a much higher win rate but with average win similar to or even smaller than average loss. Both can be profitable but with vastly different win %.
As a short term day trader, I base my strategies on the presumption that my long term success rate will be 50% - a random outcome should be reasonably achievable - and look to figuring out how to ensure a profit on that basis. Any achieved win rate over 50% is just icing on the cake.
As soon as you start requiring a win rate materially >50% to be profitable you are putting a lot of strain on your presumed ability to pick winning trades and I believe that is difficult to sustain over the long haul for most of us. There are easier ways to make money trading.