esta pendiente, atento

Question

a english expresion to say

esta pendiente, puede llegar en cualquier momento

my try:

be careful, he can get here anytime

Answer 1

I'd say:

Keep on your toes, he can get here at anytime

Answer 2

That sentence does not quiet make sense in my 18 years living in Ecuador head, I would fix it to " Estaras pendiente, puede llegar en cualquier momento" now this can imply any pronoun depending on what or who you are referring to

If it's a he, then I would say this as follows: " Watch out, he could get here at any time"

Answer 3

The literal translation of the first part is "it's pending", so I think the meaning is more like Kiro's answer - be sharp, be alert, be on your toes.