We do need a plan - badly. We will suffer hugely both economically and mentally if we do not figure it out. The government at the very least needs to publish clear conditions, in a single document, that must be met in order for the border to be open.
We're in a liferaft in a raging storm. The plan at the moment is to keep the liferaft afloat. Asking for a plan of how we can tie up to another ship is ridiculous. Especially since we don't know whether that ship will be afloat or not.
That does not prevent you from publishing the criteria you will accept, now does it?
If you do not know where you are going, how will you know if you have arrived?