From the U.S. Postal Service announcement on October 22, 2019:

The Postal Service captures the classic beauty of still-life paintings in a booklet of 20 stamps featuring 10 different portraits of fruits and vegetables. Each stamp features a collection of one kind of fruit or vegetable: red and black plums, heirloom and cherry tomatoes, carrots, lemons, blueberries, red and green grapes, lettuces, strawberries, eggplants and figs. Art director Derry Noyes designed the stamps with existing art by Robert Papp.

These stamps will be issued Friday, July 17, in Charleston WV.

Additional information will be posted below the line, with the most recent at the top.

Updated September 9th:
Here are the individual Scott catalogue numbers for this issue:
5484 (55¢) Fruits and Vegetables – Red and black plums
5485 (55¢) Fruits and Vegetables – Heirloom and cherry tomatoes
5486 (55¢) Fruits and Vegetables – Carrots
5487 (55¢) Fruits and Vegetables – Lemons
5488 (55¢) Fruits and Vegetables – Blueberries
5489 (55¢) Fruits and Vegetables – Red and green grapes
5490 (55¢) Fruits and Vegetables – Lettuce
5491 (55¢) Fruits and Vegetables – Strawberries
5492 (55¢) Fruits and Vegetables – Eggplants
5493 (55¢) Fruits and Vegetables – Figs
a. Block of 10, #5484-5493
b. Convertible booklet pane of 20, 2 each #5484-5493

Updated June 30th:
We wondered why Charleston, WV, was chosen as the first-day city: Was there an “affinity event” scheduled or some historical significance. The USPS replied:

“USPS tries to hold FDOI Ceremonies in diverse locations across the Country. We felt that Capitol Market was a great example of a community supported year-round fulltime farmers’ market. As a nonprofit organization the market raises thousands of dollars for local charities and nonprofits and also had the infrastructure from their own schedule of events to host a stamp ceremony.”

Updated June 29th:

[press release]
Postal Service Cancels Dedication Ceremony for Fruits & Vegetables Stamps
Stamps Will Still Be Available for Purchase on July 17

WASHINGTON, DC — The U.S. Postal Service is canceling the dedication ceremony for the Fruits & Vegetables stamps, previously announced for July 17, due to social distancing guidance during the coronavirus pandemic.

These new Forever stamps will still be available for purchase on July 17. A follow-up announcement for the stamps will be made prior to the release date.

Updated June 17th:

Here are the first-day postmarks for this issue:The Digital Color Postmark measures 2.97″ x 1.49″The pictorial postmark measures 2.69″ x 1.19″