Yes, you can use the COUNTIF function in Excel to calculate the percentage of "True" values in a range. Here are the steps to do so:

1. First, select the range of cells that contain the "True" or "False" values.
2. Next, use the
   Code:

   COUNTIF

   function to count the number of "True" values in the range. The formula for this would be:
   Code:

   =COUNTIF(range,"True")

3. To calculate the percentage of "True" values, divide the count of "True" values by the total number of values in the range. The formula for this would be:
   Code:

   =COUNTIF(range,"True")/COUNTA(range)

4. To exclude weekends (Saturday and Sunday) from the calculation, you can use the
   Code:

   WEEKDAY

   function to check if the date falls on a weekend. The formula for this would be:
   Code:

   =IF(WEEKDAY(date,2)<6,COUNTIF(range,"True")/COUNTA(range),"")

5. Finally, to automatically update the percentage each day, you can use the
   Code:

   TODAY

   function to reference the current date. The formula for this would be:
   Code:

   =IF(WEEKDAY(date,2)<6,COUNTIF(range,"True")/COUNTA(range),"")

By using these formulas, you can calculate the percentage of "True" values in a range, exclude weekends, and automatically update the percentage each day as you update the "True" or "False" values for the previous day.