I am using Visual studio for mac. I need to install some packages but I can't find package manager console for that.
Visual studio version: Preview 1 (7.0 build 347)
A commenter reports this extension crashes VS Community 2019 for Mac version 8.5 (Build 3183). I haven't upgraded to it, so I can't speak to this. Anyone with information/fix/alternate approach, please chime in down in the comments.
At least in Visual Studio Community 8.4.8 build 2, you can find it under Visual Studio-->Extensions, using search term "nuget":
It took me so long to find this I hope it helps someone else find it faster!