Can I ask a LOR from a professor whose class I am currently enrolled in?

[dreamingworkaholic]

Hello everyone,

It's only couple weeks away from application deadlines yet (Applying to masters at Harvard and Stanford) I have still to decide on my 3 LORs, since I decided to apply late! My choice is between a professor whom I have not taken a class with for 3 years or a professor whose class I am currently in (it is a year long course and ends in April 2022). Are you allowed to ask a LOR from a prof whose class you have not completed yet and won't know the final grade of?

Your insight is much appreciated!! 

[wellameliablack]

I see that almost a full year has passed (and I hope you got into a great program!) but I am replying because I'm curious what you decided. I'm also debating asking a prof whose class I'm currently taking. Would love to know what you did, or if anyone else can chime in.