Nice progress so far getting that first step done is always the hardest, especially when the weather keeps messing with your plans. When I built mine, the concrete stage really was the turning point; once that cured, I could pick away at the rest whenever I had an hour to spare.
If you can, plan the layout before you get too far ahead things like where the grill vents, where the prep space goes, and how you’ll run power make a big difference later. I also learned the hard way to seal everything early, even temporary surfaces, so rain doesn’t cause surprise damage.