Auto flowering plants will flower anywhere from 3-6 weeks typically. Right around 4 weeks is an average. It is important to note that they will then need at least 6 weeks of flowering, closer to 8-10 weeks for most, and up to 12 weeks for others depending on strain and ripeness desired.
You will see long white hairs (pistils), that will begin to form at the nodes, the new nodes especially. When she kicks into flowering there will be few, then they will start to form small clusters and the clusters will gradually fattening and ripening, filling in and smelling mighty fine before harvest!
Your plant shows good healthy growth so just keep it growing, she will kick into flowering soon, be patient friend 😎