I assume much will remain blocked until the restaurant is complete, but I'd expect them to want to push the construction walls back by that point at the latest. From the concept art, it looks like much of the plaza immediately outside of building will be planters and pathways, so they should be able to assemble those quickly, pushing the walls back to at least Dreamer's Point and the smaller central fountain assuming that's still in the plans. Once those are done, they can push back the walls to just surround Journey of Water and the event lawn, the latter of which may be able to happen in tandem since it also won't require major construction at this point.