“Are we still on for Friday?” checks whether a Friday plan that both people have already made remains in place. Here, on means that the planned activity will go ahead, while still signals that this is a confirmation, not a first invitation.
A: Are we still on for Friday at twelve?
B: Yes, see you at the café.
If no arrangement has been made, “Are you free on Friday?” is more natural; using still on would sound as if you had omitted a shared earlier plan. The confirmation is entirely natural between Australian friends or colleagues and is also common in British and American English.
https://dictionary.cambridge.org/dictionary/english/on-for
https://www.collinsdictionary.com/dictionary/english/on
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