We just crossed the halfway point of the tournament, when measured in terms of number of games played.  The tournament consists of a total of 63  games, of which:

32 games have been played over the past 11 days: 4 games in each of the 8 groups;

there are 16 games remaining in the group phase: 2 games in each of the 8 groups, with 4 games per day over the next 4 days (Tues-Fri);

16 teams will advance to the knockout phase: 2 teams from each of the 8 groups;

15 games will be played in the knockout phase: 8 + 4 + 2 + 1.

So the total # of 63 can be broken down as follows:

63 = 32 + 16 + 15 = 8*4 + 8*2 + (8 + 4 + 2 + 1).

Let me know if you see anything wrong with the math here.