Does RTC also Provide Packing of code

I am not sure how RTC Build does compile code for you, but as explained in https://jazz.net/library/article/38 you have tools and builders that are usually used to do the compile and link and packaging. How they do that is determined by the tools themselves and has nothing to do with the RTC part of the build.

So the answer is that RTC does not do the compiling and packaging, but within an RTC build it is possible to use the tools for your specific target system to do the compiling and packaging.