Commonwealth citizens who are living in UK and who have legally lived in UK for five years continuously, may still apply, so far as I can recall.
@The guide will be more up to date on the current policy.
Commonwealth citizens living overseas were granted consideration of a residency waiver from November 2017 in strictly limited numbers. This was due to a shortfall in people applying from UK and ceased in the first quarter of 2020.
Currently there is a surplus of applicants, so whether or when this residency waiver may be re-introduced, we really can't say.