If you get chauffeur drive then go for it.As DYKWIA mentioned i dont know if you get it kf you upgrade via the offer emails.EK510 is an overnight flight and arrives at Del in the middle of the night.Always nicer to have a few hours sleep in J and to have a chauffeur waiting at del for you.
Do you have any skywards miles. DxB del needs only 12500 miles for a y to j upgrade and miles upgrade tickets are eligible for the car service at both DXB and Del .