Why would it not be 'active' and I guess my question would be what do you mean by active? The thc/cbn are being produced by the plant while it's being grown, and while it's 'ripening' the trichomes go through their different stages - which is where all the active chemical change is happening.
Once you cut the plant you stop the process and the 'cure' concerns preserving the vegetable matter on which our lovely trichomes reside - we cure to give a smooth smoke or to enhance the taste too be sure, but mostly it's so all that hard work you just did doesn't a) mold or b) dry to bitty dust and blow away before you can smoke it.