Tivoli Gardens and Transfer excursion Copenhagen

We arrive in Copenhagen at 3.00 pm and am thinking of booking this excursion which leaves at 6.00 pm. It says transportation is included but no duration is stated on the info. Clearly you are taken there and it doesn't say transportation is only one way. Has anyone been on this trip and can let me know if you are transported back or have to make your own way back to the ship?

We where in Copenhagen a few years ago, for that cruise Celebrity had a shuttle bus running between Tivoli Gardens and the ship running at regular intervals in the evening. Don't know if this still applies.