If I'm not mistaken (I haven't actually downloaded it myself yet) the Sync Status Checker Tool is quite small. However, based on the fact that the current update (that the dealer has to do) is taking half a day to install, I'm guessing that the Sync update files could be rather large. I'd just wait until are able to do your first self-installed update, download it to your computer and see how large it is. If you feel the need to install the Status Checker before them maybe you could just borrow a small flash drive from someone.