The Holland defender headed home Declan Rice's corner on 66 minutes for the 2-1 win.
Timber said afterwards: "We deserved to win this game. First half we don't give much away. We go in at 1-1 but in the second half we finished it off which was top.
On the game being defined by corners, he also stated: "Both sides, it became an important part of the game. Today we came out well and overall we played a good game. We took the three points and then important game on Wednesday (against Brighton) again.
"We have to enjoy it. It is a privilege to be standing here with my team-mates, with Arsenal, we are fighting for these titles.
"You have to enjoy it, it's a beautiful place and we are enjoying it. Game by game and at the end hopefully something beautiful."