Deductions & credits

Okay, so once I put in in service for March 2020, since I haven't filed my 2019 taxes yet, I can start to expense all of the repairs, or do I have to wait until 2020 to get the deduction? 

 

I know I can begin the depreciation in March 2020, when I put my property in service, but when can I expense all of my repairs for 2019? Can I expense them when I file my taxes for this year (2019) after March 2020 or next calendar year (2020)?

 

This part still isn't clear to me.