You haven't established why it must be understood figuratively, especially when the object being discussed is an object of and in time.
Also, there is 'In Christ', according the knowledge of God but NOT in reality within time, till that time come. Thus though it is 'in the mind of God' we will be/are His, yet we are not yet till that time has transpired for us and become saved.
Crude illustration:
It is like in martial arts. As an instructor you know what the people 'can' do, even if they have not yet done it for themselves. Yet you do not act as though it is something already done. You must wait for that time to come to pass, that it become a reality what was known in the mind of the instructor.
Lastly, to your last point.. It does not change the fact, and in fact, works in tandem with exactly what I have been saying. God being in all time still knows what is, before it is.. and establishes my point... He knew/knows before it comes to be.