Can I transfer my Apple Cash balance to debit card?

See instructions in Transfer money in Apple Cash to your bank account or debit card - Apple Support

Note that there is a small fee for instant transfers to a debit card but transfers to a bank account are free.

See the following from the above support article:

A 1.5 percent fee (with a minimum fee of $0.25 and a maximum fee of $15) is deducted from the amount of each Instant Transfer.