Tax impact of construction loan for rental property

[Venkata Chintala]

I took a construction loan in 2018 to have a fourplex built for renting it out. The fourplex construction will not complete until mid 2019. I understand that the interest paid during construction needs to be added to cost basis while the interest before/after construction can be claimed as a expense. But this should be done during 2019 taxes, correct ? Also, the fourplex land is currently registered on my name. Would that affect my 2018 taxes in anyway?