I noticed @next1cruise that you quoted the correspondence:
Please deposit this check promptly, as it becomes void and subject to redistribution to others if not negotiated by June 24, 2020.
To clarify, tax returns are filed on the "cash basis." The settlement check is not potentially reportable/taxable until it is actually cashed.
For a general overview but a link about how to enter this in TurboTax, click this article for more information: Are legal settlements taxable?
