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If I run cacheAsBitmap = true on a complex Sprite the caching can sometimes take up to a second.
Is there any way to check for when a DisplayObject has finished being cached?
Nope, there is no possible way. However, cacheAsBitmap is using a system of creating a Bitmap object under the hood. This bitmap gets drawn with the pixel information of the DisplayObject. Hence, if you desire a fine-grain control over how cacheAsBitmap works, I would say that you should instead use Bitmap/BitmapData directly, instead of using a Sprite/MovieClip with the cacheAsBitmap feature. Hope this helps!
This article should help you if you do not know how to work with Bitmaps:
http://www.flashgameblog.at/blog-post/2010/04/08/blitting-the-art-of-fast-pixel-drawing/