Not within the same war. They were nearing fully depleting their supplies by the Russian invasion as it was. If Germany had defeated Russia, it would likely have solidified its control over Europe and established peace from there, and then spent time consolidating its power before either choosing to be content with controlling Europe or pushing forward with renewed resources and forces.
Also, Britain won its part of the war when they won the Battle of Britain. There are no realistic projections from military experts that Germany would have conquered the UK within the same war, because the British navy was fully intact and significantly powerful, and essentially invulnerable with air superiority. Britain is an island, yes, but it is a very, very large island that can be self sustaining should it need to be.