Black Ops 1 is already on Steam; it has been available there since November 7, 2010.

Quick Scoop

There isn’t a new “coming to Steam” date to wait for, because the game is already listed on the store as Call of Duty: Black Ops.

What’s going on

Recent reporting about Black Ops 1 has focused on ports to PlayStation, not a new Steam release.

Steam status

The Steam store page shows the game exists on PC through Steam, so if you were asking about the original Black Ops 1, it’s already there.

TL;DR: Black Ops 1 is already on Steam, and it’s been there for years.