The SoC gauge is a rough approximation of the state of the battery. It's not really a good indicator of 50%. IIRC, it's highly skewed. Where you're sitting is likely a lower state of charge than 50% due to the climb home.
To give you an idea of what batteries like, the Prius aggressively maintains a 60% SoC. If you go higher due to regenerative braking, it will favor a little more EV assist. If it's lower than 60%, it will lower EV assist and favor background charging to bring it up.
In short, the less your battery SoC gauge moves, the better.
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