Uncashed Cheques - Tax Return

HI

I am planning to submit my online tax return by Jan 31st. I've got a single uncashed cheque which I received as income - it is in dollars. I might not cash this cheque until next year, due to current exchange rates currently being unfavourable.

How do I account for this uncashed cheque in my tax return? Do I simply not declare it, in this year's tax return?

Thanks
PennyPincher3562