The call to be faithful concerns today only.
No one can live faithfully in the near or distant future. For example, one cannot walk in faith tomorrow, or even an hour from now, because faithfulness exists only in the moment.
One may desire to live out his life in faithfulness to God, and therefore concern himself with being faithful to grow today for today and tomorrow, but no one can be faithful tomorrow because faithfulness is accomplished in the present; when one is seen to be faithful tomorrow, tomorrow will be today.
Only God’s directions today that concern future opportunities, obligations, or trials can be objects of faithfulness because then God has made, at least, preparation for them a matter for the day.
For example, if God reveals today an opportunity or a future assignment that He has for you, then that becomes a matter of faithfulness for the moment.
“So when they had come together, they were asking Him, saying, Lord, is it at this time You are restoring the kingdom to Israel? He said to them, It is not for you to know times or epochs which the Father has fixed by His own authority; but you will receive power when the Holy Spirit has come upon you; and you shall be My witnesses both in Jerusalem, and in all Judea and Samaria, and even to the remotest part of the earth” (Acts 1:6-8).