You’re welcome! There are no advantages of maxing it all at once other than “you can invest your money into the market quicker so your money spends more time invested”.

With a HSA, your employer match does not depend on your contribution meaning you always receive the match whether you contribute or not, so that is not an issue here.

I would advise to contribute to your HSA on a normal per paycheck schedule in case you leave your employer mid-year and decide not to go with a HSA plan with your new employer, this may cause pro-rated contribution issues and having to take some contributions out and stuff.