Ggplot2, geom_sf and CRAN



Apologies if I’m missing something but it looks like ggplot2 has not been updated on cran for ages.
The version on CRAN is 2.2.1, pub date 2016-12-30

As a result, CRAN is out of sync with the ggplot2 documentation:

I see a solution here:

But I would like to know when ggplot2 will go to CRAN?