Hi, I need help on a formula ( in F column ) that can tell me if the materials are on delay or not.

Written down i see it like this :
if E3>D3+6="delay",else"ok", if E3>C3+6="delay",else"ok", if E3>B3+6="delay",else "ok"

This is clear but now i`m having the other situations where i have no info ( blanks ) in C3 or D3 , that i have no ideea how to deal it.
ex. if D3 is blank do the if E3>C3+6="delay",else"ok" and if C3 is blank do the if E3>B3+6="delay",else "ok" and if E3 is blank do the
if today()>D3+6="delay",else"ok" or if D3 is blank do the if today()>C3+6="delay",else"ok" or if C3 is blank too , do the if today()>C3+6="delay",else"ok"


okdelay.jpg


i hope i explained my problem enough soo i can get some help.
i did before the nested if-s but not with isblank and with soo many conditions.
i`m not sure even if it can be done or not .

thanks in advance.