You are correct, the email does not require you to accept the transfer, but there is a 5-7 transfer window during which you have the option to cancel the transfer if you didn't authorize it. If you do nothing, the domain will move at the end of that 5-7 holding period. Unlike most registrars, we also offer the option to expedite the transfer by clicking "Accept" as noted in the other reply. If more than 7 days have passed since you approved the transfer at the gaining registrar, please contact our support team so they can take a look to see what may be causing any delay.
Supporting you at x.co/247support