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The same time as all of the other votes, Friday evening, starting around 10:15ish.
Verification & counting of Postal Votes may already be on going, but that's just checking that the signature on the outside of the envelope matches the one held, and that the dates of birth match. And counting them at this point is just sensible.
There have been issues previously with the ballot papers being too thin, and observers (generally from the political parties) giving out 'feelings' on how things are going from the postal voting. This has generally been nipped in the bud by pointing out it's a specific electoral offence.
When are postal votes counted?