You have asked this a number of times. You will not receive a specific notice that your UE is ending in Illinois.
You have to go back through your award letters, see what you were awarded, what you have been paid, subtract the latter from the former, and that will tell you your balance.
Illinois is still participating in up to Tier IV of EUC (federal) as of today.
So what you have left depends on what Tier you are on, if any, and what you have been paid to date on that Tier.
Again, to answer your original question, no. Illinois will not send any specific letter telling you your benefits will end.