It depends if your phone is carrier locked to Verizon it is up to Verizon to provide the date. If you are using a carrier unlocked S8 the carrier does not matter and Samsung is the delay point. Good luck on that one since Samsung has a well documented no speculation comment when asked for an ETA. Personally between the abysmal update policy for my S8 unlocked phone and my S3 tablet I have decided my next phone and tablet will be ABS models. ABS stands for Anything But Samsung.
@user7TJ6TWe7wc Thanks for your inquiry. Once available, updates are released to Carriers and thereafter, it is at the Carriers discretion to release the update to customers. Since updates are released by Carriers in waves, we’re unable to determine when your device will receive an update. We appreciate your loyalty.