First mount bucket:

%python
aws_bucket_name = "<aws-bucket-name>"
mount_name = "<mount-name>"
 
dbutils.fs.mount("s3a://%s:%s@%s" % (access_key, encoded_secret_key, aws_bucket_name), "/mnt/%s" % mount_name)

than register delta folder as table:

%sql
CREATE TABLE `t`
USING delta
LOCATION '/tmp/delta'