Well, I said he was the most progressive we've had, not that he's outright progressive. I wouldn't call him that, in its modern far-left sense anyway, as surely as I would others such as Bernie Sanders or AOC.
But sure. He issued an EO on literally his first day targeting racial inequity. The American Rescue Plan gave massive tax breaks to parents. The Inflation Reduction Act promoted green tech and capped drug prices for old people. He tried to forgive student loan debt (though it's apparently failing). He's been putting public defenders and civil rights lawyers in federal positions, including one on the Supreme Court. He's been appointing officials to break up big tech businesses and enforce antitrust, and he's been public and vocal about his support of abortion rights, LGBT issues, and labor unions.
I can't think of any other President that went that far on so many issues.