If your bottling do that straight away. The spoon of sugar you add is secondary fermentation - adding pressure to the bottle from the CO2 produced by the yeast. this CO2 will keep the beer fresh. Going from keg to bottle alone won't do this and after 8 weeks the remaining yeast will be dead and adding sugar to bottles then will just give sweet beer.
If your kegging just drink it from that.
If your kegging just drink it from that.
