No; in fact it was worse in December. Look for example at the end of the trail where the trail plate has actually separated from the wood. You can barely see it in your second picture. There is further rot at the cheeks (the pieces supporting the trunnions that hold the tube in place).
Trust me on this. I own a cannon myself and manage a unit that has several. I am an Instructor and an Inspector for the National Civil War Artillery Association. Firing the SDC piece today would result in serious or even catastrophic failure of the carriage. Fortunately, the artisans at SDC would find building a new carriage a trivial exercise. The plans exist, and wheelwrights are around if they don't want to tackle that part.
The issue is academic, in any case, because, in addition to the necessary carriage work, the tube would have to be cleaned out, and the vent would have to be repaired first.
I would love to see that gun fire--and I'd be more than willing to help out!--but it is not safe to do so today, and doing it badly would create many worse problems than letting it sit.