Delaying Medicare enrollment after age 65, especially for Part B, can lead to late enrollment penalties, which increase your monthly premium for as long as you have Part B coverage. However, if you have creditable coverage through an employer or other source, you may be able to delay enrollment without penalty, as you mention.
You may have heard that Medicare will back-date your application, so you're worried about crossover with your HDHP/HSA and Excess Contributions. Medicare starts either on the first of your 65th birthday month, or on the 1st of the previous month if your birthday is on the first of the month, or if you sign up within 6 months of turning 65, the start date is set back to the 1st of your birthday month. You might want to verify with Medicare on this for your individual situation.
Here's more discussion on HSA and Medicare you may find helpful.
@FitWit
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