Stem visualizes earnings and performance data (in USD) on your Dashboard and Content Detail pages by the end of the day on the 15th of each month. If you've been paid, Stem will visualize details about your payments on the Payments page by the 15th of each month as well.
Please note that Stem receives reports from platform partners (e.g. Spotify, Apple Music) every 30-60 days. For example, if you release content in May, Stem will begin to receive performance reports for it around the end of June and will visualize data in July.