No, you are doing your 2018 taxes and the IRS instructions are to enter the 1/1/2018 outstanding mortgage principal.
Per IRS
1098 Mortgage Instructions Box 2. Outstanding Mortgage Principal as of
1/1/2018
Enter the amount of outstanding principal on the mortgage
as of January 1, 2018. If the mortgage originated during
2018 or you acquired the mortgage during 2018, leave
this box blank.
