Our internal dashboard is showing 7.6 PB at the moment. I would estimate that there is another 6 PB or so in the trash folder. So in total we should be at 13-14 PB. Our target is 20 PB. Just to give you an idea of what to expect.
For your node you can simply assume that you are holding used space + trash and you will grow by another 50% or so (without us adding surge nodes). In 6 days your trash folder will get cleaned up. That will set us back a bit but we can still make it to the 20 PB just 10 days later or so.
At the moment the node count with enough free space is getting low. Next week we are going to run tests with some surge nodes that we add to the network. Later the week I might be able to give you a new estimation. For now I would estimate that the surge nodes have to take 25% of the load = 5PB. Your node might still grow by another 50%. But it could also mean your current size including the trash folder will be your final size. There are too many variables to make a prediction. I would guess the fast nodes still get +50% but the nodes that are still the bottleneck might stay at their current size. And no I can’t tell you which nodes that would be. There is only one way to find out.