If you are already aware of the instance on which your production org is hosted, you can visit Salesforce Trust, locate your instance name, and click on “Maintenance.” By doing so, you will be able to view the specific date when the Salesforce Summer ’23 release will be rolled out to your org.
If you are unsure about your instance, the most efficient way to determine it is by navigating to “Company Information” within your Salesforce account’s “Setup” section. If you wish to gain more insights into Salesforce instances and how to identify yours, we have a comprehensive blog post that covers this topic in detail.