Currently, the SF Symbols license Agreement does not include VisionOS as a permitted target device:
"IMPORTANT NOTE: THE APPLE SOFTWARE IS TO BE USED SOLELY FOR CREATING USER INTERFACES TO BE USED IN SOFTWARE PRODUCTS RUNNING ON APPLE’S iOS, iPadOS, macOS, tvOS OR watchOS OPERATING SYSTEMS, AS APPLICABLE, AND IS SUBJECT TO THE SPECIFIC USE RESTRICTIONS SET FORTH HEREIN."