No, there was stilla ctive plans for the invasion being worked on up until the surrender. MacArthur threw all of his considerable weight behind the invasion as his crowning moment of glory almost.

In fact there were discussions about how best to use the bombs that would be constructed and ready in September, October, and November in support of the invasion. It came down basically that using them on the beaches was a bad idea, but the night or day before miles inland they could destroy marshaling points and such. And that while strategic bombing of population centers referred to as "that other use" was useful they could do a lot to ease initial resistance to the invasion.

Olympic the invasion of Kyushu the southern main island was slated to begin on 1 November 1945. While MacArthur and much of his staff was very sanguine about the prospects especially when planning began in the Spring, others were not so. Revised intelligence began to reveal the extent to which Japan had recalled many of its better units and formations from China, and which in some cases doubled or tripled the number of defending formations.

While Admiral King(Chief of Naval Operations, so top Admiral) and Nimitz(commander of the pacific fleet) in support had agreed to allow planning to continue to present a united front to the new President they both had very grave doubts about the plan. Had the 3 August nukes not worked, and bombing and invasion prep continued it is not guaranteed they would not have caused a command crisis. That was something that the Joint Chiefs tried to avoid at all costs as it meant FDR and Churchill making decisions shooting from the hip almost but King tolerated it because he often would side with the Navy. But with Truman in office now it might have been unavoidable and a complete unknown his choices.

King preferred as close as we can tell to simply follow the old War Plan orange idea and continue the blockade and bombardment of Japan until they surrendered.