Not yet. CB doesn't install on Joomla 4 at this time.
We were waiting for Beta 1 and to start tests and adaptations in cooperation with other Joomla developers.
And then continued compatibility will not be guaranteed before features-freeze and Joomla 4 RC1.
Joomla 4 is awesome and great news for Joomla. Joomla 4 beta 1 is great for tests, but it's too early to use it for new sites.