I will be arriving mid March in Shangai by cruise ship. I would like to use the maglev to downtown.

Hi, for the cruise terminal, do you refer to the SH Port International Cruise Terminal at No. 500, East Daming Road.
If so, the terminal is still about 11km from the maglev train station at Longyang Road Station.
The terminal is just close to the city downtown area.
If you want enjoy the maglev train, you can take the local subway line 14 to Tiantong Road Station from the International Cruise Terminal Station and then change to line 10 to get to East Nanjing Road Station. Then you can change to line 2 to Longyang Road Station directly.