Staking contracts are activated within 24 hours following the purchase or deposit of cryptocurrencies.
You can check the countdown of the remaining time by clicking on the three small dots at the top right of your staking contract, then on "history of my actions."
ETH staking:
Only ETH has a variable staking initiation period, specific to the Ethereum blockchain, which is why the status "In deposit" may appear for several days. Meria cannot accelerate this process.