As a general guideline, many experienced players suggest seeing a flop with around 15-20% of hands in a full-ring game. However, this percentage can change based on factors such as your skill level, the tendencies of your opponents, and the specific dynamics of the game you're playing.
It is generally considered that WWSF should be around 50%. Depending on play style many players have a WWSF a few percent high or lower than this.