Question about wait time algorithm

Looking at the last couple days, it appears that wait times are about 15% longer than originally forecasted on TP. I know that adjustments are made to expected wait times during the day, but are adjustments made for upcoming days based on these longer than expected wait times?

Put simply, if I go in today and Optimize or Evaluate plans I put together a month ago for Friday, Saturday, Sunday, will recent trends in wait times be taken into account?

Yes to a certain degree. TP uses complex maths based on 12 months data so 15% change over 3 days out of 12 months is not very much. But it is much more complex ( and secret) with data weighted etc also.