Thanks for the help everyone, concrete was poured 2 weeks ago and went great. Here is a picture of what I ended up doing to be able to screed. Probably overkill for someone who's done this a few times, but it was a big help in my case. We were able to screed quickly and get everything floated with time to spare. Also used an extension ladder with some 2x4s and a roll of metal flashing to made a chute which worked very well. Did not use it quite the way I intended but it still turned out to be very helpful.
Now that it's been 2 weeks - am I good to start moving some things in there (nothing heavy like a car or big equipment)?
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