- Are you self-isolating? I'd use 'self-isolating'. This can apply to people who are quarantining themselves because they have coronavirus, and to people who are staying at home to avoid getting it. Hope this helps!

All are correct. However, the second one asks a more general version of the question - not time specific. Another way to ask that would pose the question in relation to the present tense would be "Are you quarantining yourself"

I agree with Benjamin and David, though you could also say "are you in quarantine?"