Yes, Grammarly for Windows and Mac supports keyboard navigation.
To open the Grammarly for Windows and Mac assistant, please use the following key combination:
On Mac: Shift+Ctrl+Cmd+G
On Windows: Shift+Ctrl+Alt+G
To close the assistant, press Esc.
If desired, you can change this configuration in the settings.
Additionally, to move to the next interactive element, press Tab. To return to the previous interactive element, press Shift + Tab. To activate a link or a button, press Enter or Space.