Correct raid time.

off_cooldown_bot/open_raid.py

@@ -131,10 +131,16 @@ def build_raid_embed() -> nextcord.Embed:
     Build the open raid embed.
 
     Returns:
-        nextcord.Embed: _description_
+        nextcord.Embed: Embed that shows the raid's sign-ups.
 
     """
-    raid_time = datetime.datetime.now(tz=datetime.UTC)  # TODO make this to the next saturday at 8pm CST
+    today = datetime.datetime.now(tz=datetime.UTC).replace(hour=20)
+    saturday_idx = 5
+    days_delta = saturday_idx - today.weekday()
+    if days_delta < 0:
+        days_delta += 7
+    raid_time = today + datetime.timedelta(days_delta)
+
     embed = nextcord.Embed(title="Off Cooldown Open Raid", timestamp=raid_time)
     embed.add_field(name="Tanks", value="", inline=False)
     embed.add_field(name="Healers", value="", inline=False)