I have the same bike.
These bikes do tend to smoke for a minute or so upon starting when on the sidestand. That is normal. However, you seem to have made a point of saying it was on the center stand.
Mine will smoke a little bit when on the center stand when not ridden for a while. (I have 3 bikes and switch around which one to ride).
Smoking for 4 minutes or so and smoking after riding a bit seems a bit extreme. Could be an issue, maybe it just needs to blow itself out a bit from having sat.
I would monitor and go from there.
If it stays the same, I'd think about getting it checked out.
If it gets worse, definitely get it checked out
If it gets somewhat better, I'd probably just ride