Quote from IMQ on May, 2024,

Here's the latest update on the GCC unified visa as of May 9, 2024:

• The visa is expected to be launched by the end of 2024, allowing travel across all six GCC countries with a single permit.
• Officially called "GCC Grand Tours", it will offer a validity period of over 30 days.
• This initiative aims to boost tourism in the region by simplifying travel and showcasing the diverse offerings of each GCC nation.

Further details like application process and cost are likely to be announced closer to the launch date.