can we be sure tor still works?

I must admit I don't know the technical details of how Tor works, but I do know that since Tor nodes are communicating with each other, they must know which Tor node they're sending a particular request to and which Tor node they're receiving a request from, and the Tor node that requests the actual data must know the location of that data (the URL) even if it doesn't know the data itself. I don't see how HTTPS has anything at all to do with Tor's attempt to mask your identity. The EFF recommends using HTTPS with Tor to avoid leaking data to all third parties, including the final Tor relay, which would otherwise be able to see that data.

I'm not entirely sure if Tor is set up so that you appear to be an exit node, or if the first node you talk to just knows your location. I think the latter is the case, in which case control over all involved Tor exit nodes would negate Tor's anonymity entirely, because your request can simply be traced through all the nodes in this case. Even if the former is the case, it wouldn't help much anyway, though. To achieve anonymity from a party, your request must be routed through at least one node that isn't controlled by that party (at which point it's impossible to figure out your identity by following the route). Of course, the chance of picking a series of Tor nodes all controlled by one party is slim, and becomes more slim when more Tor nodes are available, and even more slim if you increase the number of Tor nodes you route your requests through.

One more important thing to note: in addition to knowing the entirety of the path taken destroying Tor's anonymity, it's possible to use statistical data to correlate a Tor user with a final exit node by monitoring both of these points at the same time. The chance of this occurring is already quite low and can be decreased further both by increasing the number of available Tor exit nodes and by increasing the number of Tor users. But it's always a possibility, and as far as I'm aware it's the greatest weakness of Tor.