As with all questions like this .... it will depend on a) the competitiveness of the degree subject , b) everyone else's results, c) how many spaces they have left, if any, d) how far 'below offer' that Uni wants to go to fill that course, e) your grades.
Yes, they may make a decision before A level Results Day.
Or they may not.
So, its best not to overthink all of this, because all you will do is get even more worried about it.