Yes, your contribution limit is based on your 2024 income. That is one of the reasons that you have until April 15, 2025 to make a contribution designated for 2024 -- so you know exactly what you are allowed to contribute.
Alternatively, if you contribute now and it is too much, you can either withdraw a portion of the contribution tax-free (all withdrawals of Roth IRA contributions are tax-free) or you can recharacterize the contribution as a contribution in a traditional IRA. Then you can do a backdoor Roth IRA conversion, assuming you do not have any funds in a traditional pre-tax IRA. If you do have pre-tax funds in a traditional IRA, your options are a bit more complicated but a recharacterization is still allowed.
