If you click join on a an Oracle Node you will get some more information about the node. You can see the amount available to stake on each node by looking at "Open for stake". As you can see, on the first Oracle Node there is ~56,000 XEQ that can still be staked under that node. The amount of time coins will be locked is shown by "Days Left" where your stake for the first Oracle Node would be ~18 days. The amount you will earn is shown at the top as the Daily Reward, which is the total amount each Oracle Node earns.