Actually, no, you don't need to turn in updated versions of your UML diagrams (although you are welcome to update it IF you think it will help your team to have an improved architectural plan as you move forward with the project). It may also be helpful to write some Java code before revising your diagram.
At this point, you should really be focusing your effort on the project -- and yes, you should be writing code for it, preferably in pair programming sessions with teammates. You have the shared repositories now, and you have the basic skills you need to start developing this software.
There will be challenges, and you'll need to learn a lot as you go, but... go you must! We need to have (small) working demos of the software by Monday of week 7!