Evenepoel and Pogacar have faced in a TT 5 times prior. On average Evenepoel takes 2.26s per km on Pogacar.This seems optimistic for a 25k TT.
However, 4 out of those 5 TT's were championship TT's, and the only TT they faced each other in a GC was an opening TT in Tirreno. So all TT's were raced "fresh".
That said, the first TT both should be "relatively" fresh as well, and Evenepoel looks bullish on the flats so far.