At the rate they are chalking up acceptances, I would have your signed form dated and ready to send back on Friday, just I case they announce they have achieved the magic figure.
Good question.
I believe they must send the Compulsory Acquisition form within 4 weeks of the end of the offer period.
Allow another few days for payment.
I'm pretty sure we would be subject to the same 14 days payment terms as those who have recently accepted.