Probably Bay Area yes, but the definition of "liberal" is slippery. It's certainly the most Democratic and most "left-leaning" as we would call it now, but ever since 2016 the Democrats have favored more moralistic "crowd-enforced" social restriction while Republicans have favored less. A metro area that we call "libertarian" today, like Colorado Springs, might be seen as "more liberal than the Bay Area" at least in some ways by, for example, a time traveler from 2004.
Yes, the term liberal is deeply problematic in these discussions. A better question might be what are the most left-wing/left-leaning metros in the country?
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