The 744t is the master clock. Everything gets jammed from it. Time of day is always good but be wary of going past midnight as there is no hour 13 and the slate will show hour 1 again.
Setting up the RED to accept external TC is a bit of a chore if you’ve never done it before. You can eliminate the lockit box and use a TC slate jammed from the 744t but you’ll have to be certain every take gets slated just as if you were shooting film.
Be sure the frame rate on your recorder is set for 29.97 if they’re shootin at 30fps and 23.97 if they’re shooting at 24fps. As a guide for editing you can send a guide track to the RED at mic level via a wireless hop. Good luck.
Eric