Look at the bottom of the EAC window, it says e.g. '7 compression tasks left' (meaning EAC makes a queue which says 'you gotta encode this and that track').
It allows you to rip a lot of CDs one after the other, and when the last one is finished, EAC might still be busy for a long time doing the encoding work

Note: what if you close EAC in the middle of such a queue? Will it be interrupted? Yes (the current track is finished though), but next time you restart EAC the encoding will be resumed

howevern,
I think that there is no way to
[start a new CD extraction while the previous is still being encoded]
in case EAC is set to 'hide external compressor window'. (but that can be changed easily)