Note 113 — DISSERTATION IV.
Reading edition
"The present tense in English hath often the sense of the future; as when do you go out of town? I go tomorrow: that is, when will you, shall you go? I shall go. If you do well, that is, shall do well, you will be rewarded: As soon as, or when you come there; that is, shall come, turn on your right hand: With these forms of speaking, the verb is always placed in the future in Latin, Greek and Hebrew."——Bayley's Intro. to Lan. Lit. and Phil. 99.
This critical writer has explained this mode of speaking with accuracy; but it would be more correct to call this form of the verb, an elliptical future, than to say, the present tense has the sense of the future.