Stems isn’t in the current prime 4 plus firmware already. However the Prime 4 plus will be the first model which will be getting beta firmware with stems.
The beta testing program for the first of the stems firmware is mentioned here
Continuing the discussion from Prime4+ and Engine 3.1.1 but without stems:
It’s a shame that some of these self-appointed vloggers and (cough cough) “influencers” just kinda skip over the informative details when such factors might de-sensationalize their “breaking news”
Some of their video ditties only serve to influence people to click the little “X” in the corner of the video window.