lakrsrool ... I take it that stands for Lakers Rule?
Anyway, I too am on Dial Up and since last year or the year before, I too requested the very thing you're now requesting. Unfortunately, it doesn't appear like avast is gonna be incorporating any such System Tray Icon indication of an active Virus Definitions update in progress.
My guess would be that avast deems Dial Up Users in the extreme minority and thus, doesn't deem it worthwhile incorporating such a perk as much as us Dial Up Users NEED one and would really like one.
Unfortunately, I've been forced to be alert and be ready to make the connection of when Browsing / computer operation is sluggish and there is heavy Hard Drive LED activity ... I check the Task Manager for the existence of avast.setup.
avast 4.x used to have this perk. I don't know why avast can't just put it right back in. Instead, other perks that aren't needed, are being put in.