You have until April 15th to let a school know that you are coming. You do not need to put your deposit in as soon as you hear. If you are unsure if you will get in other schools, you can wait until closer to April 15th to pay anyone a deposit.
I think you just put in all of your applications now and if they are not on CSDCAS and want your updated grades from the fall, they will request them.
That's my understanding