Riddle?

Why Sunday. Explain Please

I wish yesterday was tomorrow, because today would be Friday.
If today were Sunday, yesterday would be Saturday.
If Saturday were tomorrow, today would be Friday.

I thought : Wednesday.

If today were Wednesday, tomorrow would be Thursday.
If yesterday were Thursday, today would be Friday.

I wish yesterday was tomorrow, because today would be Friday = I wish today was Friday, means I wish tomorrow would be Saturday.

I wish yesterday was tomorrow.
Because in actuality tomorrow will be Saturday, it means that Saturday was yesterday. Thus, today is the day after Saturday, which is Sunday.

Friday she said I wish that it would b yesterday's tomorrow which is just saying the same thing as saying today (then it would b Friday)

Sunday

Monday