The GUI will give you an estimate on how long it might take, on average, for you to win, based on your number of plots and the overall number of plots in the wild (Total Network Space).
Or, you can run:
$ chia farm summary
The above will give you an average expected time to win.
Frankly, with 28 TB of plots, you will probably not win for decades, if ever.
Back in August, you had better odds, based on the the Total Network Space at that time (which was probably far, far lower than today).
Even so, I think you were lucky to win with 18 TB of plots (you need a few hundred TB of plots these days, and even then it will probably take a month (if you are lucky) or much longer to win.
As to re-plotting:
It is my understanding that no single plot has any advantage or disadvantage over any other plot (assuming the same “K” size plots are being used).
A plot that won has an equal chance of winning (again) vs any other plots.
(someone please correct me if I am mistaken)
As to moving your 2 XCH to your other system:
If your other system is synced, and you are signed in with the same wallet, then you should see your 2 XCH on the other system.
If your other system is using a different wallet, then you would have to transfer your XCH to the other wallet’s address. I cannot advise you any further, because I have not done that. But looking at the GUI, it looks straightforward to send XCH to any wallet’s address.
Others could advise you on transaction fees. I think that you can avoid them, at the cost of it taking more time for your transfer to be recorded and completed. But I am not really sure about this.