"We arrived at the top yesterday."
Translation:Nós chegamos no topo ontem.
Not exactly. "Em cima" means simply "on". "No topo" means something higher, which takes some effort to get there. "Estamos no topo da árvore/montanha" (we are at the top of the tree/mountain). Or something thats higher than the speaker: os melhores abacates ficam no topo = The best avocados are on the top.