Information from Chevrolet about the initial C8 Stingray ordering process which covers the first ten+ weeks of production has been released to dealers.
To help the rollout process, Chevy will offer certain colors & select options first, and then every couple weeks it will gradually add a few more until by the tenth week of production, all colors & selected equipment options are included.

As with anything C8-related, Chevy has changed the normal ordering process for dealers during the initial rollout of the 2020 C8 Corvette Stingray
Dealers have set allocations numbers for the year as well as for the first three months of production.

Once a month from September through December, dealers can place orders based on the following criteria while each new month adds to the colors and options offered previously:

September (Weeks 1-2 production)
• Arctic White, Black, Torch Red, Shadow Gray, Sebring Orange, Ceramic Gray
• 2LT/3LT – Base
• 2LT/3LT – w/Magnetic Ride (No Front Lift)
• 2LT/3LT – w/Front Lift and Magnetic Ride
October (Weeks 3-5 production)
• Elkhart Lake Blue, Long Beach Red
• 2LT/3LT – w/Front Lift (No Magnetic Ride)
November (Weeks 6-9 production)
• Blade Silver, Zeus Bronze, Accelerate Yellow
• 1LT – w/o Magnetic Ride or Navigation
December (Weeks 10 & beyond production)
• All Colors Available
• 1LT – w/Magnetic Ride (no Nav)
• 1LT – w/Nav (No Magnetic Ride)
• 1LT – wMagnetic Ride and Nav

Chevy is starting with 6 colors in the first two weeks of production and all of those are upper trim models.
Do not see anything that specifies Z51 so assume the Performance Package will be orderable from the start.

Do not worry out over this list if you have a certain combination and it’s falling to November or December.
They are talking about the initial three months of production with this order cycle.

Production is scheduled to start sometime in December & with a two week Christmas/New Year’s holiday shut down, and then quality control checks and other validation,
the first cars won’t hit dealers until sometime closer to February while cars from November/December will most likely be built in February and March with delivery some 6-8 weeks later.
Talk with your dealers about questions you may have with the ordering process.

After prices are released next Aug 15th,
most with reservations will probably start hearing from dealers to get your orders finalized.

You can also reach out to the Corvette Concierge at 1-866-424-3892
as they can answer many questions about the car and the ordering process.