Yahoo Finance provides real-time streaming quotes for many exchanges. Real-time data is available during an exchange's market hours, and in some cases during pre-market and post-market hours. However, not all markets will stream in real-time.
Below the quote price on the summary page, you'll see the related exchange and whether the quote is real-time or delayed. If the quote is real-time, you'll see the current date and time listed beneath the price. Real-time price changes will be reflected by showing green numbers when the stock is up and red when it's down.
