If you take them off sooner rather than later then you will be able to hold on to them in the case you ever need them (they have become STUPID expensive).
In that case, you can just leave the entire thing the way it is until you're ready to completely remove it. You really don't need to cap or disconnect anything if you're going to take it all off anyway.
If it were me... I'd just replace the smog pump. O'Reiley's has them for around $130.
That is... until you're ready to do the entire exhaust.
The longer you run those cats with no smog pump running, the faster they will clog and kill performance.
Even when planning out your exhaust, I would include a 3-way cat. They do not require a smog pump at all.