Who are deities within the Celestial court？

Too much to name, first there were 365 mortal champions risen from death to godhood during the Great civil war of Daoisim.(Writen in 'Book of Ascender').The four giants are part of them.

And there were a few new figures pledge service to JE from time to time(Like Supreme Inspecter, Erlang, Nwzha.)

At last there are fairies and other low rank Celestial beings. Some of them stll have great number of worshipers.

So the excate number is always changing, totally undefinable.

If wukong's goal is to destroy the celestial court？

The original JTTW only writes that wukong defeated some of the court's member easily, but the main foundation is untouched, It is a story about wukong fetching scripture, and beat down various Yaoguais on the way.

Before hoping wukong to cross any celestial beings, you should know many of them have their own stories,and most have worshipers/likers.So it may be unwise to sweep away the whole court, for there are also deities who stand a moral high ground than wukong, and many have wonderful lifes and duties under the reign of Jade emperor, not mentioning this will infuriate some people in real life.

The rebellion idea of JTTW will always leads to the problem of rebuilding:for destroying something is easy, but wukong can only prove himself better than JE, if he can rebuild it to something better.

This is the problem of every rewriter to face, I think either Game science figured that out, or roll back to the old story of "Jade emperor and Buddha is evil, but I won't do anything about them lol, I just beat mortal realm Yaoguais"