Will not start on first start of the day

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From your description, it sounds like fuel pressure is bleeding off as the vehicle sits overnight. There is a check valve in the fuel pump that’s meant to hold pressure in the line and fuel rails, however those valves commonly fail which allows all the fuel to drain back into the tank overnight.

Take a look at the link below. It provides an excellent repair guide for “hard to start” conditions. It also talks specifically about fuel pressure bleed down.

https://www.2carpros.com/articles/engine-cranks-excessively-before-starting

Let us know what you find!

The black smoke is actually a very helpful piece of information. I know you said you have fuel pressure when you turn the key on. What we need to determine is what the fuel pressure is in the morning(after the vehicle sat all night) before you turn the key on. The system should maintain pressure all night. Based on the black smoke, it sounds like the fuel pressure is in fact bleeding down, but it's bleeding down through one or more fuel injectors. Not the fuel pump. So when you go to start it, not only do you have an empty fuel line/rail, you also have a lot of extra fuel laying in the cylinders. Once it finally starts, the fuel mixture is extremely rich which results in the black smoke and the rough running condition.