Yup got a dial tone
Assuming its the correct phone number, it quite possible that remote activation may not occur until later, as these tasks are robotically controlled, and your turn may not have come yet.
I would normally expect the Openreach technician to have checked at the cabinet with a tester, but that process may have changed now.
Its also possible that they ran out of time, and it will be done tomorrow. You should receive a text message when activation is complete, and it will show as completed on MyBT.
It could easily update when system updates at midnight
Unless you have access to a cable provider, then cancelling will not help, as all the other providers use Openreach, so the issue with ports will be the same, and you may lose your allocated port if the cabinet is full. All the providers use the same cabinet, and its possible there is a fault on the cabinet which is causing the problem, especially if its a new build area. There will be other customers affected as well.
I assume if you work from home, you are not running a business, as that is not allowed on a residential connection?