This source link states the current gen sales through as of 31 March 2018 to be:
Playstation 4 - 76.6m units
Xbox One - Est. 39.1m units
Nintendo Switch - 17.79m units
It's been an incredibly slow march for the XBO to get out of the 30m region but it seems to be getting there and hopefully by now just have hit or be hitting the milestone whilst PS4 should be on the verge of surpassing the lifetime sales of the Playstation 3. Sales of Switch so far this year are reportedly flat compared to last year which suggests they're strong but not strong enough to meet Nintendo's 20m sales target. Presumably the momentum places the NS somewhere in the early 20m's by now.
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