Universities will get the results on Sat 11 Aug. They will finalize all the decisions they can - given that they might be waiting for missing results, decisions by other institutions on students holding insurance offers, etc. - and these will then be made visible to students by UCAS on Thu 16 Aug. Universities are under an absolute embargo until results day: they must not indicate to students awaiting A-level results that they have or have not met the conditions. Things like confirming a student's accommodation before the results are published are in breach of the university's contract with UCAS and likely to get the university into big, big trouble.
Sometimes things go on beyond results day. Exam boards occasionally miss the deadlines for entering results for some A-levels (usually maths, in my experience), so that universities have to wait a few days before they know whether someone has met the conditions. Also, a lot of students who have missed the requirements will apply to exam boards for re-marks of one or more A-levels, which means the places they were offered can't be offered to anyone else who's closer to meeting the requirements until the results of the re-mark are received (as long as this is no later than 31 Aug).