Is there a command to tell me if I am the default sysimage or a custom one?

I am using VSCode, I turn on the feature about using a custom sysimage. But often, I am not sure if I am using the default sysimage or a custom one. How can I tell?

Is there a command I can type? E.g. one that shows me all compiled packages?

I found this: https://www.reddit.com/r/Julia/comments/5xy8s1/list_all_julia_precompiled_packages/

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