If you have the time on your hands might as well get started with the study part. IATRA is the ATPLs condensed into a single smaller 50 question exam. You will expand your knowledge base and it never hurts to acquire knowledge sooner rather than later.
Don't take the exam right away though, as it is only good for 2 years and it might be a lot longer than that before you'll land a job that needs a multi-crew qualification. There's a lot of pilots on furlough and it's going to be several years for the industry to reabsorb them all. Most of the opportunities are going to be in the North.