Yes, the sentence is grammatically correct. It expresses a prayerful wish for God's grace and wisdom to guide and precede the speaker and others throughout the new day and week. The use of "Amen" at the end reinforces the sincerity and finality of the prayer.
Here are some possible rephrasing options:
1. "May we be guided by God's grace and wisdom in this new day and week. Amen."
2. "Let God's grace and wisdom lead us as we begin this new day