The grass is growing on a sod farm near Turlock. Half of the red seats have been installed. The drywall is up and the furniture is on the way. The 49ers on Wednesday provided a tour of their airy, new, 69,000-seat stadium, which confirmed what anyone driving past the facility in recent months has suspected – the heavy lifting is done and the project is nearly finished. Project manager Jack Hill estimates that construction on Levi's Stadium, which began in April 2012, is 80 percent complete. He said approximately 3 percent of the remaining work will be accomplished each month from this point forth, meaning the stadium should be ready to use by August, just in time for the first scheduled event, a Major League Soccer match between the Seattle Sounders and the San Jose Earthquakes on Aug. 2. The 49ers will break in their new field with an exhibition game some time in the two weeks after that.