And Now We Play the Waiting Game

Final interview was on Friday. I thought it went pretty well, but I forgot to ask for a rough decision timeline. They said they were looking to have someone start in "roughly mid-February," so presumably I'd hear either way this week, but when is a good time to send a follow-up and how should I phrase it?

ETA: I did send a follow-up e-mail right after the interview (within about 3 hours) with pleasantries and thanks, but I forgot to ask for a timeline.