I say go for it...I sent mine a little over a week later. Turns out Adcom met way before then, since I was in the last interview group before they met. 🙄 BUT it is still courteous to send one. I don't think it will come off wrong. They interview many applicants, and just having them see that you sent one (regardless if they met yet) probably gets your name stuck with them just a little bit longer..which can help if they haven't met yet, and can help if you decide to attend, since you will be seeing a good amount of your interviewers as administrators, professors, etc..