Here is the Synthetix oracle address on etherscan. https://etherscan.io/address/0xac1ed4fabbd5204e02950d68b6fc8c446ac95362
You can see when and how often the updateRates calls are made.
At anypoint you can access what the exchange rates are on the ExchangeRates Contract
If you want to see the current rate for sBTC. Enter sBTC and click the "Query" button.
The 18 numbers from the right is the decimal place so in this case after putting the value into the converter https://etherconverter.online/ will show the price of sBTC is 9294.8611338663351868