Blackjack win probability

I’m going to Vegas for the first time and new in this sub but am planning on playing some blackjack, so I’ve been going over basic strategy. I downloaded a training app to practice and have been consistently around 90% correct. Now I know blackjack is a net negative expectation with something like a 49% win rate if I remember correctly, assuming you play perfectly according to basic strategy.

I’m wondering if I’m playing basic strategy correctly 90% of the time, what is my total win rate. Is it as simple at 90% of 49%? Or is there a way to come out with true expected win percentage?

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