It depends what time you expect to be at the border.
We leave Zeebrugge on Monday morning and hit the Basel/St Louis border that evening, straight in, no waiting.
Provided everything is in order it takes 15 minutes, from handbrake on to handbrake off.
The St Die tunnel has been open for a while now btw. That way is quicker by 20 minutes compared to a good run through Strassbourg, it’s also about €20 cheaper on tolls.
If Monday is a holiday, we’ll park up in Belgium just before the border. Whatever time you leave at, there’ll be a huge Q at any of the Basel area border crossings, well over an hour just to get into the parking. It’ll probably have cleared by mid afternoon, but I don’t know as I’ve never left it that late. I want to try and get my drops off, any collections and back out of Swiss the same day.
I don’t know what it’s like on a normal morning, coming off a Dover ferry. I don’t ever use that route.