I've seen something similar backfire for a guy I worked with. He had this idea that he would get his shit done Monday-Thursday and have an easy WFH Friday.
People ended up doing most work towards end of sprint and Friday would usually be really busy - basically he always had to be present and management would offload priority stuff to him since he was done. So he'd end up busting his ass all week. Eventually he got tired and reverted to standard schedule - but this meant his relative performance dropped - I saw him get singled out in a review for performance drop (and not a lot of people noticed when he was going above the norm).
But the end result would have been the same - he wouldn't finish his tasks ahead of time, he wouldn't have spare capacity on Friday - management notices this and thinks he's underperforming
Obvious your mileage may vary, and timeframes matter. I'm talking about getting my pieces done weeks or months in advance of when we need to ship, not days or hours.
People ended up doing most work towards end of sprint and Friday would usually be really busy - basically he always had to be present and management would offload priority stuff to him since he was done. So he'd end up busting his ass all week. Eventually he got tired and reverted to standard schedule - but this meant his relative performance dropped - I saw him get singled out in a review for performance drop (and not a lot of people noticed when he was going above the norm).