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Master Black Belt
Not exactly. Martial arts training itself will increase your muscular endurance, not strength. Those are two different things.I've no experience with wing chun, but just training a martial art will improve your strength. Instead of thinking about needing to be strong to do a martial art, think instead that doing a martial art will give you physical strength.
The good news is that muscular endurance is actually more relevant to fighting than strength.
But here's some more bad news: the increase in muscular endurance (AND cardiovascular endurance) from martial arts training alone will top off at the level needed to keep up with the class. This is true of any group exercise activity, not just martial arts. Because progressive overload is required for continuous development, you're eventually going to have to look beyond the martial arts training.