Has anyone done online BLC at fort McCoy just wonder what to really expect class wise and check in times?

I went through in June 2020, so changes are possible. It was online, we had accountability 0630-0645, battle rhythm 0645-07, and we generally worked until 1130, and had an hour and a half break for lunch. Some days went until 1700, other days we got done early and were done by 1400.
Class-wise, make sure you put effort into discussions, and speak up often, as part of your grade is participation. Essays are the largest portion of your grade, so use your time wisely and get them done ahead of time so they can be peer-reviewed. You’ll also be graded on leading PRT over camera, so study the verbiage and movements verbatim.
Best of luck, and let me know if you have any other questions or concerns!

Follow your orders and the list given to you in your packet.

You do that and you'll be just fine

You should get everything in your welcome letter down to how you're graded.