Wait time is utterly woeful, Amazon says "FREE Prime delivery February 22 - March 21". So 3 to 7 weeks.
But if you're slowly collecting PC parts while you wait for GPU prices to stop being silly, it might be OK?
$150 seems very cheap for brand name H670 board (which is slightly better than a brand name B660, which start at about $175 right now)
I think backorder is the word you're looking for