timing of shower base replacement - tax

I'm soon going to move out of my PPOR as we are moving to Perth, and will rent it out as an IP.

Our shower base is badly cracked. We plan to replace it with a new base.

Would it be deductable if we do the replacement when the house is 'available for rent' but before tenant moves in... or only if the tenant is already in place... or not at all and only depreciable.