[Grammar] the latest or at the latest

[Will17]

Hello!

Can we sometimes omit "at" in this case, please?

"Please inform me on Monday, at the latest."

Thank you.
W

 

[5jj]

Not in BrE.

 

[riquecohen]

Not in BrE.

It's the same in AmE. You could also say "Please inform me no later than Monday."