In your previous question you say you're not sure if changing your diet is required...this couldn't be farther from the truth. If you want to maximize results, diet is by far the most important factor in addition to sleep and recovery. Also, this "minimum" concept is horribly flawed but I won't even address that here, I'm sure you're already aware anyways.
To answer your actual question, you want to recruit the most muscle fibres in any given exercise that you do. Studies with EMGS as well as my own and various others' experiences show that the most effective way to achieve this from a tempo perspective is this:
When you're lifting the weight (concentric), i.e pushing, pulling, squatting up, you want to do this portion of the movement as fast as humanly possible in order to recruit max motor units and develop a faster motor firing rate...effectively improving muscular contraction and overall power/strength. This should be anywhere less than or equal to one second.
When you're lowering the weight, i.e descending on the pullup/pushups/squat/dip, you need to maximize time under tension (to a certain limit) in order to break down the most muscle fibres (so you can build them back up stronger and bigger through protein synthesis hence why I said your diet is crucial). This means you need to control the descent which implies that this portion should take around 1-4 seconds depending on your energy levels. You can tweak this number all the time in order to keep your muscles confused. E.g maybe one day keep this number at 4 seconds, but the next day keep it at 1 second.
The isometric portion of the movement, i.e the part where you're at the top in the pullup or parallel in the squat can vary depending on your goals and won't affect anything too much as long as you make sure to actually utilize it. What I mean is, you should be "squeezing" the necessary muscles with EVERY rep at the isometric "hold" ANYWAYS, how long you do it however depends on what you want and really won't make too much of a difference and won't make you stronger or bigger...although it will make you better at holding isometric positions. So as long as you do this part for at least a second, and squeeze hard, you're fine.
As a working example, let's go over how you would do a pullup.
Start with your arms extended fully and pull your scapula back and engage your lats and arms, squeezing the bar as hard as possible in order to recruite the most muscle fibres.
Exhale in order to promote nitric oxide flow as you pull your self up as fast as possible in an explosive manner, make sure your form is good.
When you're at the top , hold the position for at least a second, and squeeze your back so you can feel the right muscles working.
It is highly debated whether you should inhale or exhale at the top of the movement, and doesn't really matter to be honest, but since for the pullup you already exhaled, start to slowly inhale.
Lower yourself over 1-4 seconds while slowly building up oxygen by inhaling small amounts.
Reach your starting position again, and use the oxygen you just built up by the slow inhaling to explode up by exhaling and repeat.
It's important to exhale hard during the lifting portion of ANY move as releasing the oxygen suddenly will allow your muscles to contract harder and faster. For example if you watch sports, you'll notice that boxers and fighters will exhale and make sounds as they throw punches or kicks...(Bruce Lee used to just make crazy sounds but that's still exhaling) and that sprinters will repeatedly exhale short bursts of air very fast in order to be more explosive.
