Well I didn't had that luck.
After upgrading my Samsung S9, and starting to like the new version, later in the day when having more than 40% of battery, my phone switched off. I tried to power it on, but the battery percentage showed 0% and it shut down by it self.
Just to point out, that I hadn't got any issues till the upgrade done yesterday, and I start carrying my powerbank with me, as I don't know if or when will happen again.
In meantime, if anyone had the same issue, please share it.
Welcome to the community!
What version of the S9 do you have? Was it purchased from Fido? I understand the OS Upgrade schedule states that the upgrade should have been available in January. However, it appears as though there was a delay from Samsung Canada. Sources suggest it might be released February 24, 2020 or possibly in March of 2020 (see here).
Hope this helps 😀