No, put it in a container or jar with a tight fitting lid. Do not over fill it, you need room for expansion. Shake it or atleast keep it moving, it can take 30 minutes, or more.
When you can no longer see in the container or feel any movement inside, then you have whipped cream.....but if you want butter, and buttermilk, keep shaking it. You'll soon see it start to 'slide'. Keep shaking until you have a solid lump with milky liquid. Pour off the liquid, that is the buttermilk and can be used for making biscuits, pancakes or whatever. Shake it some more to get as much of the liquid out of the lump as possible. If left in, the liquid can sour and give the butter an off taste.
Then you need to 'wash' it.........pour in some cold water and shake and pour that off. Keep doing that until the water is clear. About 2 or 3 times, maybe 4. Now you can add some salt and press or mix it in.......or leave it unsalted.