I'm sorry to hear of your loss.
In the case of the TFSA, you as the beneficiary will receive any gains as taxable income and will report it on the tax return of the year that you receive the income. For the RRIF, you (the beneficiary) will be taxed on any gains after the date of death. In both cases you’ll get T-slips for your 2025 tax return, and you’ll just need to enter those slips in TurboTax.