It is rapidly declining, being replaced with what scholars call general (rural) West Flemish.
[1][2][3] According to Hinskens & Taeldeman (2013), /r/ is realized as a voiced uvular trill with little friction [ʀ̝].
[1] However, according to Sebregts (2014), the vast majority of the speakers in Bruges realize /r/ as alveolar, not uvular.
[4] Definitely, the most common realization of /r/ is a voiced alveolar tap [ɾ], which is used about four times more often than the second most common realization, which is a voiced alveolar trill [r].
He also lists a central vowel (which probably means [ə], [ɐ] or both of these) and elision of /r/, both of which are very rare.