Is it best to call out the morning of or the night before?

I’ve been running a fever all weekend. I was waiting to see if I felt better today, but I feel about the same. My temp is 102. I’m having chills, sweats, body sore, nauseous and light headed when I stand for a long time.

It’s only 3 of us in the office. It’s a small loan company so it’s not like we have others we call in. We just work without them. It’s 8:30 here I was wondering if that’s too late to text my boss or should I just wait til the morning?