How likely am I to get offers

Im predicted at least A*AA (CS, maths, further maths) but might get maths moved up to an A*
GCSES: 88887777765
contextual ✅
applying to Imperial (software engineering), st andrews (CS), edinburgh (CS), KCL (CS), chester (CS, safe)

I really want to go to edinburgh or st andrews but im feeling nervous about my application

No one can say for certain. You've got all but one competitive uni there - I hope you'll be happy to go to Chester if you get four other rejections.
Imperial's minimum entry standard is A*A*A, so you will need to have maths moved up to realistically have a chance - there's also the August reconsideration period which would be available to you.
That being said, you do have good predicted grades for the others - so with a good PS, there's a fair chance of an offer, but of course nothing is guaranteed.