As far as I know though I am not as lucky as you, what I know is that my current employer where A Rated Sponsor but due to no needing anyone to sponsor they didn't update and weren't sponsor anymore. When I joined this company, they said they would apply for sponsor once more and luckily it took only 1 week and my employer were in A Rated Sponsor list again.
However, my friend who worked in different company, his employer were very new and it took them few months, I forgot exactly how much time it took but people from HO visited their site and took sometime but it did work.
Now I think it is all your choice, how much time you have, how much risk you want to take.
Anyways best of luck