There is no magic hour for a once-daily probiotic capsule. What matters is picking a time you can repeat.
SodaTide is a once-daily vegetarian capsule. The official page frames it as a routine and does not name a required time of day. Check the label on your bottle for any timing instruction, since that is the one that applies to you.
Link the capsule to something you already do every day, such as breakfast or brushing your teeth. Because refrigeration is recommended, many people keep the bottle in the fridge next to a daily item, which doubles as a reminder. Keep the time steady for several weeks so you can judge the trial fairly, and use a simple log (see the log guide on this blog) to note how you feel.