That's pretty early in the morning, so your options are going to be fairly limited.
I would say to use this:
https://disneyworld.disney.go.com/guest-services/minnie-van-service/
There is also OKW Bus > Hollywood Studios > Walk to Dolphin...
but this has issues. It depends on when HS opens that morning. It could be crowded. I think the ferry dock at HS is still closed, so you have to walk. The front of HS is chaos because of all the construction...
You could...
Bus to EPCOT > Walk through EPCOT > Ferry to Dolphin
but that's a lot of walking and if one link goes bad, you could be very late.
On your way back you will have more options...
Bus > Disney Springs > Old Key West
Ferry > EPCOT > Walk Through EPCOT > Bus to OKW
Bus from Boardwalk / Beach / Yacht > Disney Springs > OKW
Once it is later in the day you can take the ferry / bus / walk from Springs to OKW.
Since Disney Springs won't be open before 10, your bus options to and from there are limited / non-existent in the morning.