To be on hand.

Sinõnimos: à postos (at ready)/acessível/em mãos/á disposição/pronto(a) para/disponível.

Project team members circulated throughout the room to answer any questions, and an interpreter was on hand to provide English-Spanish language translation
Services, if required.

The chef likes to have fresh ingredients on hand for his recipes.
O chef gosta de ter ingredientes frescos à mão (acessível) para suas receitas.
Source: Reverso Context

The hotel always has extra towels on hand for guests at the pool.
O hotel sempre tem toalhas extras disponíveis para os hóspedes na piscina
Source: Ibidem

Their four vehicles were therefore on hand as soon as the airplane came to a stop. They readied
Themselves along the shore of the lagoon to fight a fire should one break out.
Os seus quatro veículos estavam, portanto, à disposição assim que o avião parou. Prepararam-se ao longo da margem da lagoa para combater um incêndio, caso este ocorresse.