I can offer two observations. First, the reason for the RICE method is to get the swelling down as soon after the injury as possible. Applying heat following the onset of the injury can actually aggravate the swelling, and pain. I think you need to decide for yourself whether you're ready to work out again. It's such a common mistake (I'm guilty at times) to start too early and then either really injure yourself or just prolong the amount of time you need to lay off.