No, the Republicans cannot, by themselves, block a vote on a Biden SCOTUS nominee.

[onenote]

These is a post in GD that claims that the Republicans have a way to block a vote on Biden's SCOTUS nominee and, implicitly, blames Schumer for making a bad deal with McConnell in the power sharing agreement. (S. Res. 27).

https://www.democraticunderground.com/?com=view_post&forum=1002&pid=16289270

Don't be fooled. The article cited in that OP is spreading disinformation.

Specifically, it claims that if the Judiciary Committee splits evenly on a nomination, it cannot reach the floor if a motion to discharge passes with 60 votes. WRONG. All it takes to discharge the nomination is a simple majority of the whole senate. And multiple nominations have been moved to the floor by means of motion to discharge that passed with a simple majority. In most instances, the simple majority is achieved because some Republican senators choose not to vote. But even where the motion to discharge is tied 50-50, it passes because Harris can break the tie ---- something she has done on a couple of occasions.

https://www.senate.gov/legislative/LIS/roll_call_votes/vote1171/vote_117_1_00462.htm

https://www.senate.gov/legislative/LIS/roll_call_votes/vote1171/vote_117_1_00161.htm