I am not an expert on this but I guess you might have a chance. Let's analyse it this way:

We know from this forum that CX frequently oversells (but is very good at estimating eventual load since some passengers will not show up). What they do is that they upgrade econ passengers to business (according to tier or whatever). Plus, a lot of people hold duplicate bookings (or are waiting for other flights to clear) and only move their bookings rather close to departure. Quite often, people who use their miles to upgrade still have their econ seats held in the system altho they wont be sitting in econ.

Whilst the econ cabin shows itself full at the moment, the fact is that you can still be waitlisted - this means the situation is not too bad. If the flight is really in great demand, even the waitlist will be full and closed and they will not allow you to waitlist - which is NOT the case here.

With your silver status, you have a bit of priority also.

Your added advantage is that you seem to be traveling alone. As for going to the airport, I would imagine that to be a definite advantage, if the waitlist situation doesn’t clear before hand. The reason is that few people will take the trouble to wait at the airport and you only need one passenger to change his mind, to be late, to forget his passport or whatever.

From what I have noticed, it is not uncommon for waitlisted passengers such as yourself to be able to get on. My hunch is that your waitlist will clear maybe 24 hours before the flight.

At any rate, I think and hope you will be able to get on. Good luck and keep us informed.