GA creators are allowed one week to send the gift to the winner. While it's great to send the key immediately after the GA ends, that isn't always realistic as the creator might be busy, or even asleep at the time. A few hours late is fine. I think most people wouldn't mind as long as you send it within a day. If you don't like to keep your winner waiting, then you can set your GAs to end at a time when you know you'll be free. For example, I usually go with 9 PM on weekdays since I'm most likely on my computer then.

Those two DLCs will still appear as "Reduced Value" on your profile since that's the classification for those items. If you want confirmation on the 5-entries rule I told you about, you can check the "Contributor Value and Levels" section of the FAQ (accessible from the "Help" dropdown menu at the top). It states "if a giveaway is invite only, region restricted, or limited to a whitelist or Steam group, it will only add contributor value if it receives 5 or more entries". Technically, that means fully public GAs with less than 5 entries will still give you CV, though it's virtually impossible for that to happen. Anyway, when you have the time, I suggest you read both the FAQ and the Guidelines (also found under "Help") to better understand how the site works. In fact, read the Guildelines first as violating those can lead to suspensions.