Tenpastseven - I believe Cambridge confirmed in a tweet that they have managed to accept all those who made their offers into the 2020 cohort.
If you are concerned though, ring admissions for the particular college and ask. This is what DS did 
I also emailed Durham re- deferrals because DS couldn’t get through and was just holding for ages. Nobody answers the phone there, it seems. I asked if they had a high proportion of deferrals due to their initiative to offer bursary payments to those meeting offers who were prepared to defer. That was over two weeks ago - no answer.
Anyway, UCAS form into the school today, as per their procedure.
They had a week of formal exams last week, so only went in at exam times. It was past A-level papers. So this feels like their first week back in school really. Hope it doesn’t close by Friday!