It is for sure not going to work at this time. You'll just have to track this thread for the next few days. I would say it's unlikely that this supercharger will be up and running by the 28th.
I don't doubt it's not working right now, but I think it's within the realm of possibility to have at least one of the superchargers up before the 28th so Elon could say at the announcement "As of today we have opened X more superchargers across the country/world/etc"