How to make sure that the data in the excel is fully loaded before the SSIS job runs

Hi, I am trying to load data from excel into SQL server using SSIS.

This excel file is placed in a active directory by a oracle job every morning. My SQL Server job looks for the excel to load the data into SQL Server.

The problem I have is, the excel file does not come in at a particular time each day.

The package runs even if the excel is not fully loaded with the oracle data. SO how can I make sure that the excel is fully loaded with data before the SSIS job runs.

Thank You.