When the time comes today or tomorrow for you to cry out to the Lord, remember the promise of Psalm 145:18, 19 - The Lord is near to all who call on Him, to all who call on Him in truth. . .He hears their cry and saves them.
God's invitation to call upon Him comes with a holy desire to meet our deepest need. But it also comes with the expectation that we will be real with Him, honest about our helplessness without Him and our complete dependence upon Him.
Call upon the Lord anytime but be real with Him every time.