Here is the week 51 update in terms of the two big consoles in Japan's path to be able to reach the commonly stated (in these sales threads) estimates for 2018 sales (2 mil for PS4, 4 mil for Switch) .
TWS - This week's sales
GD - Goal differential, the difference between the average week needed from last week compared to this week's sales
YTD - Units sold in 2018 so far including this week's sales
AWN - Average weekly sales needed to reach the estimate for the console.
Somewhat surprising as both consoles are down for week 51. On Era they surmise that Christmas Eve not being in week 51 resulted in weaker numbers than expected which is possible. Nonetheless it looks like Switch will be the closest to its goal by percentage and it looks like the PS4 will be the closest to its goal by units. After an interesting year both systems seem to have performed (barring any craziness in the final week) around the same relative to their set goals.
NS: 120k, 145k, 240k, 200k, 295k, 250k = 1.25m would end just above 3.5 mil for the calendar year.
PS4: 20k, 25k, 30k, 25k, 40k, 30k = 170k would end up just above 1.5 mil for the calendar year.