Sailor needed

No, that's not always right. There are often sand bars at the mouths of rivers where they meet the sea. It's actually common for ships to leave port on a rising tide, so as to clear the bar. That was particularly true in days of sail.

Leaving on a falling tide could strand the ship upon the bar.

job said:

Hmmm .... that's what I was afraid of.

So I have to know about the sailing conditions on the Thames.

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What you have to know are the tidal conditions. High tide and low tide.

Every river has them. Usually, there are a couple of tides a day. And, they do vary day to day, so your MC can set sail when you'd like them to.

Google tide charts/times or conditions for the Thames, and you should get what you need.