I don't think anyone knows at this point.
A lot of it will depend on when the construction works can get back to work. And then how many workers do they put on a project.
I would expect Tron to be a high priority item as they would want it open for the 50th.
But nobody knows how much work is left on the inside. At least this is all known technology and a copy of an existing ride.
Guardians is more complicated. Again, nobody knows how much is done inside. There are stories about video scenes that have not been filmed yet that are needed. And this is an all new ride, which could pose other issues . I wouldn't be surprised to see this pushed to 2022, but thats only a guess.