The CI completed their three-match tour yesterday on a high by defeating Cornwall by 25 runs at Menheniot.
It was their first tour success following defeats at Somerset and Devon earlier this week.
CI skipper Keith Dennis said: ‘It was great to get back to winning ways and now we must wait for the group to be completed to find out if we have qualified for the knock-out stages.
It’s going to be close because several of the counties have lost two and three games so I’m pretty sure it is going to be decided by averages.
‘I won the toss yesterday and elected to bat on a dreadful wicket, it was soft, the bounce was low and there was no life in it.
160 would have been a good score but we managed to get 189 in 45 overs which was a great effort.
‘Paul Robson was unfortunate not to reach 50 while Guernsey’s John Beasley batted magnificently towards the end hitting three big sixes in a knock of 46.
‘Barry Middleton gave us a great start in their reply by getting three early wickets.
Barry bowled really well together with Guernsey’s John Tall and Ralph Anthony.
‘I don’t know if we’ve scrapped through to the last eight or not, we’ll just have to wait and see.’ Group matches must be completed by the end of this month.
